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hcsalmon1-Chess-Engine-Test/Rust/main.rs
Coding with Tom d668d099ca Create main.rs
2025-01-12 21:47:55 +00:00

4649 lines
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Rust
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use std::time::Instant;
mod constants;
static mut PIECE_ARRAY: [u64; 12] = [0; 12];
static mut WHITE_TO_PLAY: bool = true;
static mut CASTLE_RIGHTS: [bool; 4] = [true, true, true, true];
static mut EP: usize = NO_SQUARE;
static mut BOARD_PLY: u8 = 0;
const RANK_1_BITBOARD: u64 = 18374686479671623680;
const RANK_2_BITBOARD: u64 = 71776119061217280;
const RANK_3_BITBOARD: u64 = 280375465082880;
const RANK_4_BITBOARD: u64 = 1095216660480;
const RANK_5_BITBOARD: u64 = 4278190080;
const RANK_6_BITBOARD: u64 = 16711680;
const RANK_7_BITBOARD: u64 = 65280;
const RANK_8_BITBOARD: u64 = 255;
const MAX_ULONG: u64 = 18446744073709551615;
const WKS_CASTLE_RIGHTS: usize = 0;
const WQS_CASTLE_RIGHTS: usize = 1;
const BKS_CASTLE_RIGHTS: usize = 2;
const BQS_CASTLE_RIGHTS: usize = 3;
const WKS_EMPTY_BITBOARD: u64 = 6917529027641081856;
const WQS_EMPTY_BITBOARD: u64 = 1008806316530991104;
const BKS_EMPTY_BITBOARD: u64 = 96;
const BQS_EMPTY_BITBOARD: u64 = 14;
const EMPTY_BITBOARD: u64 = 0;
const A8: usize = 0;
const B8: usize = 1;
const C8: usize = 2;
const D8: usize = 3;
const E8: usize = 4;
const F8: usize = 5;
const G8: usize = 6;
const H8: usize = 7;
const A7: usize = 8;
const B7: usize = 9;
const C7: usize = 10;
const D7: usize = 11;
const E7: usize = 12;
const F7: usize = 13;
const G7: usize = 14;
const H7: usize = 15;
const A6: usize = 16;
const B6: usize = 17;
const C6: usize = 18;
const D6: usize = 19;
const E6: usize = 20;
const F6: usize = 21;
const G6: usize = 22;
const H6: usize = 23;
const A5: usize = 24;
const B5: usize = 25;
const C5: usize = 26;
const D5: usize = 27;
const E5: usize = 28;
const F5: usize = 29;
const G5: usize = 30;
const H5: usize = 31;
const A4: usize = 32;
const B4: usize = 33;
const C4: usize = 34;
const D4: usize = 35;
const E4: usize = 36;
const F4: usize = 37;
const G4: usize = 38;
const H4: usize = 39;
const A3: usize = 40;
const B3: usize = 41;
const C3: usize = 42;
const D3: usize = 43;
const E3: usize = 44;
const F3: usize = 45;
const G3: usize = 46;
const H3: usize = 47;
const A2: usize = 48;
const B2: usize = 49;
const C2: usize = 50;
const D2: usize = 51;
const E2: usize = 52;
const F2: usize = 53;
const G2: usize = 54;
const H2: usize = 55;
const A1: usize = 56;
const B1: usize = 57;
const C1: usize = 58;
const D1: usize = 59;
const E1: usize = 60;
const F1: usize = 61;
const G1: usize = 62;
const H1: usize = 63;
const NO_SQUARE: usize = 65;
const TAG_NONE: usize = 0;
const TAG_CAPTURE: usize = 1;
const TAG_WHITEEP: usize = 2;
const TAG_BLACKEP: usize = 3;
const TAG_WCASTLEKS: usize = 4;
const TAG_WCASTLEQS: usize = 5;
const TAG_BCASTLEKS: usize = 6;
const TAG_BCASTLEQS: usize = 7;
const TAG_B_KNIGHT_PROMOTION: usize = 8;
const TAG_B_BISHOP_PROMOTION: usize = 9;
const TAG_B_QUEEN_PROMOTION: usize = 10;
const TAG_B_ROOK_PROMOTION: usize = 11;
const TAG_W_KNIGHT_PROMOTION: usize = 12;
const TAG_W_BISHOP_PROMOTION: usize = 13;
const TAG_W_QUEEN_PROMOTION: usize = 14;
const TAG_W_ROOK_PROMOTION: usize = 15;
const TAG_B_CAPTURE_KNIGHT_PROMOTION: usize = 16;
const TAG_B_CAPTURE_BISHOP_PROMOTION: usize = 17;
const TAG_B_CAPTURE_QUEEN_PROMOTION: usize = 18;
const TAG_B_CAPTURE_ROOK_PROMOTION: usize = 19;
const TAG_W_CAPTURE_KNIGHT_PROMOTION: usize = 20;
const TAG_W_CAPTURE_BISHOP_PROMOTION: usize = 21;
const TAG_W_CAPTURE_QUEEN_PROMOTION: usize = 22;
const TAG_W_CAPTURE_ROOK_PROMOTION: usize = 23;
const TAG_DOUBLE_PAWN_WHITE: usize = 24;
const TAG_DOUBLE_PAWN_BLACK: usize = 25;
const WP: usize = 0;
const WN: usize = 1;
const WB: usize = 2;
const WR: usize = 3;
const WQ: usize = 4;
const WK: usize = 5;
const BP: usize = 6;
const BN: usize = 7;
const BB: usize = 8;
const BR: usize = 9;
const BQ: usize = 10;
const BK: usize = 11;
const EMPTY: usize = 12;
pub fn get_rook_attacks_fast(starting_square: usize, mut occupancy: u64) -> u64 {
occupancy &= constants::ROOK_MASKS[starting_square];
occupancy *= constants::ROOK_MAGIC_NUMBERS[starting_square];
occupancy >>= 64 - constants::ROOK_REL_BITS[starting_square];
let converted_occupancy: usize = occupancy as usize;
return constants::ROOK_ATTACKS[starting_square][converted_occupancy];
}
pub fn get_bishop_attacks_fast(starting_square: usize, occupancy: u64) -> u64 {
let mut mutable_occupancy = occupancy;
mutable_occupancy &= constants::BISHOP_MASKS[starting_square];
mutable_occupancy *= constants::BISHOP_MAGIC_NUMBERS[starting_square];
mutable_occupancy >>= 64 - constants::BISHOP_REL_BITS[starting_square];
return constants::BISHOP_ATTACKS[starting_square][mutable_occupancy as usize];
}
fn bitscan_forward_separate(bitboard: u64) -> usize {
let bitboard_combined: u64 = bitboard ^ (bitboard - 1);
let calculation: u128 = 0x03f79d71b4cb0a89 * bitboard_combined as u128;
let calc_truncated: u64 = calculation as u64;
let index: usize = (calc_truncated >> 58) as usize;
return constants::DEBRUIJN64[index];
}
const MOVE_STARTING: usize = 0;
const MOVE_TARGET: usize = 1;
const MOVE_PIECE: usize = 2;
const MOVE_TAG: usize = 3;
const PINNED_SQUARE_INDEX: usize = 0;
const PINNING_PIECE_INDEX: usize = 1;
fn get_spaces(ply: usize) -> String {
match ply {
0 => "".to_string(),
1 => " ".to_string(),
2 => " ".to_string(),
3 => " ".to_string(),
4 => " ".to_string(),
5 => " ".to_string(),
6 => " ".to_string(),
_ => "".to_string(),
}
}
fn debug_move(starting_square: usize, target_square: usize, piece: usize, ply: usize) {
const SQ_CHAR_Y: [char; 65] = [
'8', '8', '8', '8', '8', '8', '8', '8', '7', '7', '7', '7', '7', '7', '7', '7', '6', '6',
'6', '6', '6', '6', '6', '6', '5', '5', '5', '5', '5', '5', '5', '5', '4', '4', '4', '4',
'4', '4', '4', '4', '3', '3', '3', '3', '3', '3', '3', '3', '2', '2', '2', '2', '2', '2',
'2', '2', '1', '1', '1', '1', '1', '1', '1', '1', 'A',
];
const SQ_CHAR_X: [char; 65] = [
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'a', 'b',
'c', 'd', 'e', 'f', 'g', 'h', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'a', 'b', 'c', 'd',
'e', 'f', 'g', 'h', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'a', 'b', 'c', 'd', 'e', 'f',
'g', 'h', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'N',
];
const PIECE_NAMES: [u8; 13] = [
b'P', b'N', b'B', b'R', b'Q', b'K', b'P', b'N', b'B', b'R', b'Q', b'K', b'_',
];
const PIECE_COLOURS: [u8; 13] = [
b'W', b'W', b'W', b'W', b'W', b'W', b'B', b'B', b'B', b'B', b'B', b'B', b'_',
];
let spaces: String = get_spaces(ply);
println!(
"{}{}.{}{} {}{}{}{}",
spaces,
ply,
PIECE_COLOURS[piece] as char,
PIECE_NAMES[piece] as char,
SQ_CHAR_X[starting_square],
SQ_CHAR_Y[starting_square],
SQ_CHAR_X[target_square],
SQ_CHAR_Y[target_square]
);
}
fn set_starting_position() {
unsafe {
EP = 65;
WHITE_TO_PLAY = true;
CASTLE_RIGHTS[0] = true;
CASTLE_RIGHTS[1] = true;
CASTLE_RIGHTS[2] = true;
CASTLE_RIGHTS[3] = true;
PIECE_ARRAY[0] = 71776119061217280;
PIECE_ARRAY[1] = 4755801206503243776;
PIECE_ARRAY[2] = 2594073385365405696;
PIECE_ARRAY[3] = 9295429630892703744;
PIECE_ARRAY[4] = 576460752303423488;
PIECE_ARRAY[5] = 1152921504606846976;
PIECE_ARRAY[6] = 65280;
PIECE_ARRAY[7] = 66;
PIECE_ARRAY[8] = 36;
PIECE_ARRAY[9] = 129;
PIECE_ARRAY[10] = 8;
PIECE_ARRAY[11] = 16;
}
}
fn set_starting_position_board(board: &mut Board) {
board.ep = 65;
board.is_white = true;
board.castle_rights[0] = true;
board.castle_rights[1] = true;
board.castle_rights[2] = true;
board.castle_rights[3] = true;
board.piece_array[0] = 71776119061217280;
board.piece_array[1] = 4755801206503243776;
board.piece_array[2] = 2594073385365405696;
board.piece_array[3] = 9295429630892703744;
board.piece_array[4] = 576460752303423488;
board.piece_array[5] = 1152921504606846976;
board.piece_array[6] = 65280;
board.piece_array[7] = 66;
board.piece_array[8] = 36;
board.piece_array[9] = 129;
board.piece_array[10] = 8;
board.piece_array[11] = 16;
}
fn set_trick_white() {
unsafe {
EP = 65;
WHITE_TO_PLAY = true;
CASTLE_RIGHTS[0] = true;
CASTLE_RIGHTS[1] = true;
CASTLE_RIGHTS[2] = true;
CASTLE_RIGHTS[3] = true;
PIECE_ARRAY[0] = 65020788473856000;
PIECE_ARRAY[1] = 4398314946560;
PIECE_ARRAY[2] = 6755399441055744;
PIECE_ARRAY[3] = 9295429630892703744;
PIECE_ARRAY[4] = 35184372088832;
PIECE_ARRAY[5] = 1152921504606846976;
PIECE_ARRAY[6] = 140746083544320;
PIECE_ARRAY[7] = 2228224;
PIECE_ARRAY[8] = 81920;
PIECE_ARRAY[9] = 129;
PIECE_ARRAY[10] = 4096;
PIECE_ARRAY[11] = 16;
}
}
fn is_occupied(bitboard: u64, square: usize) -> bool {
return (bitboard & constants::SQUARE_BBS[square]) != 0;
}
fn get_occupied_index(square: usize) -> usize {
for i in 0..12 {
unsafe {
if is_occupied(PIECE_ARRAY[i], square) {
return i;
}
}
}
return 12;
}
fn fill_board_array() -> [usize; 64] {
let mut board_array: [usize; 64] = [0; 64];
for i in 0..64 {
board_array[i] = get_occupied_index(i);
}
return board_array;
}
fn print_board() {
unsafe {
const PIECE_NAMES: [u8; 13] = [
b'P', b'N', b'B', b'R', b'Q', b'K', b'P', b'N', b'B', b'R', b'Q', b'K', b'_',
];
const PIECE_COLOURS: [u8; 13] = [
b'W', b'W', b'W', b'W', b'W', b'W', b'B', b'B', b'B', b'B', b'B', b'B', b'_',
];
println!("Board:");
let board_array = fill_board_array();
for rank in 0..8 {
print!(" ");
for file in 0..8 {
let square: usize = (rank * 8) + file;
print!(
"{}{} ",
PIECE_COLOURS[board_array[square]] as char,
PIECE_NAMES[board_array[square]] as char
);
}
println!();
}
println!();
println!("White to play: {}", WHITE_TO_PLAY);
println!(
"Castle: {} {} {} {}",
CASTLE_RIGHTS[0], CASTLE_RIGHTS[1], CASTLE_RIGHTS[2], CASTLE_RIGHTS[3]
);
println!("ep: {}\n", EP);
println!("ply: {}\n", BOARD_PLY);
println!();
println!();
}
}
fn is_square_attacked_by_black(square: usize, occupancy: u64) -> bool {
unsafe {
let square_usize: usize = square ;
if (PIECE_ARRAY[6] & constants::WHITE_PAWN_ATTACKS[square_usize]) != 0 {
return true;
}
if (PIECE_ARRAY[7] & constants::KNIGHT_ATTACKS[square_usize]) != 0 {
return true;
}
if (PIECE_ARRAY[11] & constants::KING_ATTACKS[square_usize]) != 0 {
return true;
}
let bishop_attacks = get_bishop_attacks_fast(square, occupancy);
if (PIECE_ARRAY[8] & bishop_attacks) != 0 {
return true;
}
if (PIECE_ARRAY[10] & bishop_attacks) != 0 {
return true;
}
let rook_attacks = get_rook_attacks_fast(square, occupancy);
if (PIECE_ARRAY[9] & rook_attacks) != 0 {
return true;
}
if (PIECE_ARRAY[10] & rook_attacks) != 0 {
return true;
}
return false;
}
}
fn is_square_attacked_by_white(square: usize, occupancy: u64) -> bool {
unsafe {
let square_usize: usize = square ;
if (PIECE_ARRAY[0] & constants::BLACK_PAWN_ATTACKS[square_usize]) != 0 {
return true;
}
if (PIECE_ARRAY[1] & constants::KNIGHT_ATTACKS[square_usize]) != 0 {
return true;
}
if (PIECE_ARRAY[5] & constants::KING_ATTACKS[square_usize]) != 0 {
return true;
}
let bishop_attacks = get_bishop_attacks_fast(square, occupancy);
if (PIECE_ARRAY[2] & bishop_attacks) != 0 {
return true;
}
if (PIECE_ARRAY[4] & bishop_attacks) != 0 {
return true;
}
let rook_attacks = get_rook_attacks_fast(square, occupancy);
if (PIECE_ARRAY[3] & rook_attacks) != 0 {
return true;
}
if (PIECE_ARRAY[4] & rook_attacks) != 0 {
return true;
}
return false;
}
}
fn print_ulong(bitboard: u64) {
for rank in 0..8 {
for file in 0..8 {
let square = rank * 8 + file;
process_square(bitboard, square);
}
println!();
}
println!("ulong: {}", bitboard);
}
fn process_square(bitboard: u64, square: usize) {
// Implement your logic here for processing the square
// For example:
if (bitboard & (1 << square)) != 0 {
print!("1 ");
} else {
print!("0 ");
}
}
fn print_move_no_nl(starting_square: usize, target_square: usize, piece: usize) {
const SQ_CHAR_Y: [char; 65] = [
'8', '8', '8', '8', '8', '8', '8', '8', '7', '7', '7', '7', '7', '7', '7', '7', '6', '6',
'6', '6', '6', '6', '6', '6', '5', '5', '5', '5', '5', '5', '5', '5', '4', '4', '4', '4',
'4', '4', '4', '4', '3', '3', '3', '3', '3', '3', '3', '3', '2', '2', '2', '2', '2', '2',
'2', '2', '1', '1', '1', '1', '1', '1', '1', '1', 'A',
];
const SQ_CHAR_X: [char; 65] = [
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'a', 'b',
'c', 'd', 'e', 'f', 'g', 'h', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'a', 'b', 'c', 'd',
'e', 'f', 'g', 'h', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'a', 'b', 'c', 'd', 'e', 'f',
'g', 'h', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'N',
];
const PIECE_NAMES: [u8; 13] = [
b'P', b'N', b'B', b'R', b'Q', b'K', b'P', b'N', b'B', b'R', b'Q', b'K', b'_',
];
const PIECE_COLOURS: [u8; 13] = [
b'W', b'W', b'W', b'W', b'W', b'W', b'B', b'B', b'B', b'B', b'B', b'B', b'_',
];
print!(
"{}{} {}{}{}{}",
PIECE_COLOURS[piece] as char,
PIECE_NAMES[piece] as char,
SQ_CHAR_X[starting_square],
SQ_CHAR_Y[starting_square],
SQ_CHAR_X[target_square],
SQ_CHAR_Y[target_square]
);
}
struct Board {
piece_array: [u64; 12], // Corresponds to unsigned long long pieceArray[12]
is_white: bool, // Corresponds to int isWhite
ep: usize, // Corresponds to int ep
castle_rights: [bool; 4], // Corresponds to int castleRights[4]
}
fn perft_inline_struct(board: &mut Board, depth: i32, ply: usize) -> u64 {
//if depth <= 0 {
// return 1;
//}
let mut move_list: [[usize; 4]; 220] = [[0; 4]; 220];
let mut move_count: usize = 0;
let white_occupancies: u64 = board.piece_array[0]
| board.piece_array[1]
| board.piece_array[2]
| board.piece_array[3]
| board.piece_array[4]
| board.piece_array[5];
let black_occupancies: u64 = board.piece_array[6]
| board.piece_array[7]
| board.piece_array[8]
| board.piece_array[9]
| board.piece_array[10]
| board.piece_array[11];
let combined_occupancies: u64 = white_occupancies | black_occupancies;
let empty_occupancies: u64 = !combined_occupancies;
let mut temp_bitboard: u64;
let mut check_bitboard: u64 = EMPTY_BITBOARD;
let mut temp_pin_bitboard: u64;
let mut temp_attack: u64;
let mut temp_empty: u64;
let mut temp_captures: u64;
let mut starting_square: usize = NO_SQUARE;
let mut target_square: usize;
let mut pin_array: [[usize; 2]; 8] = [[NO_SQUARE; 2]; 8];
let mut pin_number: usize = 0;
//Generate Moves
if board.is_white {
let mut white_king_check_count: u8 = 0;
let white_king_position: usize = bitscan_forward_separate(board.piece_array[WK]);
//pawns
temp_bitboard =
board.piece_array[BP] & constants::WHITE_PAWN_ATTACKS[white_king_position ];
if temp_bitboard != 0 {
let pawn_square: usize = bitscan_forward_separate(temp_bitboard);
if check_bitboard == 0 {
check_bitboard = constants::SQUARE_BBS[pawn_square ];
}
white_king_check_count += 1;
}
//knights
temp_bitboard =
board.piece_array[BN] & constants::KNIGHT_ATTACKS[white_king_position ];
if temp_bitboard != 0 {
let knight_square: usize = bitscan_forward_separate(temp_bitboard);
if check_bitboard == 0 {
check_bitboard = constants::SQUARE_BBS[knight_square ];
}
white_king_check_count += 1;
}
//bishops
let bishop_attacks_checks: u64 =
get_bishop_attacks_fast(white_king_position, black_occupancies);
temp_bitboard = board.piece_array[BB] & bishop_attacks_checks;
while temp_bitboard != 0 {
let piece_square: usize = bitscan_forward_separate(temp_bitboard);
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS[white_king_position ]
[piece_square ]
& white_occupancies;
if temp_pin_bitboard == 0 {
if check_bitboard == 0 {
check_bitboard = constants::INBETWEEN_BITBOARDS
[white_king_position ][piece_square ];
}
white_king_check_count += 1;
} else {
let pinned_square: usize = bitscan_forward_separate(temp_pin_bitboard);
temp_pin_bitboard &= temp_pin_bitboard - 1;
if temp_pin_bitboard == 0 {
pin_array[pin_number][PINNED_SQUARE_INDEX] = pinned_square;
pin_array[pin_number][PINNING_PIECE_INDEX] = piece_square;
pin_number += 1;
}
}
temp_bitboard &= temp_bitboard - 1;
}
//queen
temp_bitboard = board.piece_array[BQ] & bishop_attacks_checks;
while temp_bitboard != 0 {
let piece_square: usize = bitscan_forward_separate(temp_bitboard);
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS[white_king_position ]
[piece_square ]
& white_occupancies;
if temp_pin_bitboard == 0 {
if check_bitboard == 0 {
check_bitboard = constants::INBETWEEN_BITBOARDS
[white_king_position ][piece_square ];
}
white_king_check_count += 1;
} else {
let pinned_square: usize = bitscan_forward_separate(temp_pin_bitboard);
temp_pin_bitboard &= temp_pin_bitboard - 1;
if temp_pin_bitboard == 0 {
pin_array[pin_number][PINNED_SQUARE_INDEX] = pinned_square;
pin_array[pin_number][PINNING_PIECE_INDEX] = piece_square;
pin_number += 1;
}
}
temp_bitboard &= temp_bitboard - 1
}
//rook
let rook_attacks: u64 = get_rook_attacks_fast(white_king_position, black_occupancies);
temp_bitboard = board.piece_array[BR] & rook_attacks;
while temp_bitboard != 0 {
let piece_square: usize = bitscan_forward_separate(temp_bitboard);
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS[white_king_position ]
[piece_square ]
& white_occupancies;
if temp_pin_bitboard == 0 {
if check_bitboard == 0 {
check_bitboard = constants::INBETWEEN_BITBOARDS
[white_king_position ][piece_square ];
}
white_king_check_count += 1;
} else {
let pinned_square: usize = bitscan_forward_separate(temp_pin_bitboard);
temp_pin_bitboard &= temp_pin_bitboard - 1;
if temp_pin_bitboard == 0 {
pin_array[pin_number][PINNED_SQUARE_INDEX] = pinned_square;
pin_array[pin_number][PINNING_PIECE_INDEX] = piece_square;
pin_number += 1;
}
}
temp_bitboard &= temp_bitboard - 1;
}
//queen
temp_bitboard = board.piece_array[BQ] & rook_attacks;
while temp_bitboard != 0 {
let piece_square: usize = bitscan_forward_separate(temp_bitboard);
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS[white_king_position ]
[piece_square ]
& white_occupancies;
if temp_pin_bitboard == 0 {
if check_bitboard == 0 {
check_bitboard = constants::INBETWEEN_BITBOARDS
[white_king_position ][piece_square ];
}
white_king_check_count += 1;
} else {
let pinned_square: usize = bitscan_forward_separate(temp_pin_bitboard);
temp_pin_bitboard &= temp_pin_bitboard - 1;
if temp_pin_bitboard == 0 {
pin_array[pin_number][PINNED_SQUARE_INDEX] = pinned_square;
pin_array[pin_number][PINNING_PIECE_INDEX] = piece_square;
pin_number += 1;
}
}
temp_bitboard &= temp_bitboard - 1;
}
//If double check
if white_king_check_count > 1 {
let occupancies_without_white_king: u64 = combined_occupancies & (!board.piece_array[WK]);
temp_attack = constants::KING_ATTACKS[white_king_position ];
temp_empty = temp_attack & empty_occupancies;
while temp_empty != 0 {
target_square = bitscan_forward_separate(temp_empty);
temp_empty &= temp_empty - 1;
if (board.piece_array[BP] & constants::WHITE_PAWN_ATTACKS[target_square ])
!= 0
{
continue;
}
if (board.piece_array[BN] & constants::KNIGHT_ATTACKS[target_square ]) != 0 {
continue;
}
if (board.piece_array[BK] & constants::KING_ATTACKS[target_square ]) != 0 {
continue;
}
let bishop_attacks: u64 =
get_bishop_attacks_fast(target_square, occupancies_without_white_king);
if (board.piece_array[BB] & bishop_attacks) != 0 {
continue;
}
if (board.piece_array[BQ] & bishop_attacks) != 0 {
continue;
}
let rook_attacks: u64 =
get_rook_attacks_fast(target_square, occupancies_without_white_king);
if (board.piece_array[BR] & rook_attacks) != 0 {
continue;
}
if (board.piece_array[BQ] & rook_attacks) != 0 {
continue;
}
move_list[move_count][MOVE_STARTING] = white_king_position;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_NONE;
move_list[move_count][MOVE_PIECE] = WK;
move_count += 1;
}
//captures
temp_captures = temp_attack & black_occupancies;
while temp_captures != 0 {
target_square = bitscan_forward_separate(temp_captures);
temp_captures &= temp_captures - 1;
if (board.piece_array[BP] & constants::WHITE_PAWN_ATTACKS[target_square ])
!= 0
{
continue;
}
if (board.piece_array[BN] & constants::KNIGHT_ATTACKS[target_square ]) != 0 {
continue;
}
if (board.piece_array[BK] & constants::KING_ATTACKS[target_square ]) != 0 {
continue;
}
let bishop_attacks: u64 =
get_bishop_attacks_fast(target_square, occupancies_without_white_king);
if (board.piece_array[BB] & bishop_attacks) != 0 {
continue;
}
if (board.piece_array[BQ] & bishop_attacks) != 0 {
continue;
}
let rook_attacks: u64 =
get_rook_attacks_fast(target_square, occupancies_without_white_king);
if (board.piece_array[BR] & rook_attacks) != 0 {
continue;
}
if (board.piece_array[BQ] & rook_attacks) != 0 {
continue;
}
move_list[move_count][MOVE_STARTING] = white_king_position;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_CAPTURE;
move_list[move_count][MOVE_PIECE] = WK;
move_count += 1;
}
} else {
if white_king_check_count == 0 {
check_bitboard = MAX_ULONG;
}
let occupancies_without_white_king: u64 = combined_occupancies & (!board.piece_array[WK]);
temp_attack = constants::KING_ATTACKS[white_king_position ];
temp_empty = temp_attack & empty_occupancies;
while temp_empty != 0 {
target_square = bitscan_forward_separate(temp_empty);
temp_empty &= temp_empty - 1;
if (board.piece_array[BP] & constants::WHITE_PAWN_ATTACKS[target_square ])
!= 0
{
continue;
}
if (board.piece_array[BN] & constants::KNIGHT_ATTACKS[target_square ]) != 0 {
continue;
}
if (board.piece_array[BK] & constants::KING_ATTACKS[target_square ]) != 0 {
continue;
}
let bishop_attacks: u64 =
get_bishop_attacks_fast(target_square, occupancies_without_white_king);
if (board.piece_array[BB] & bishop_attacks) != 0 {
continue;
}
if (board.piece_array[BQ] & bishop_attacks) != 0 {
continue;
}
let rook_attacks: u64 =
get_rook_attacks_fast(target_square, occupancies_without_white_king);
if (board.piece_array[BR] & rook_attacks) != 0 {
continue;
}
if (board.piece_array[BQ] & rook_attacks) != 0 {
continue;
}
move_list[move_count][MOVE_STARTING] = white_king_position;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_NONE ;
move_list[move_count][MOVE_PIECE] = WK ;
move_count += 1;
}
//captures
temp_captures = temp_attack & black_occupancies;
while temp_captures != 0 {
target_square = bitscan_forward_separate(temp_captures);
temp_captures &= temp_captures - 1;
if (board.piece_array[BP] & constants::WHITE_PAWN_ATTACKS[target_square ])
!= 0
{
continue;
}
if (board.piece_array[BN] & constants::KNIGHT_ATTACKS[target_square ]) != 0 {
continue;
}
if (board.piece_array[BK] & constants::KING_ATTACKS[target_square ]) != 0 {
continue;
}
let bishop_attacks: u64 =
get_bishop_attacks_fast(target_square, occupancies_without_white_king);
if (board.piece_array[BB] & bishop_attacks) != 0 {
continue;
}
if (board.piece_array[BQ] & bishop_attacks) != 0 {
continue;
}
let rook_attacks: u64 =
get_rook_attacks_fast(target_square, occupancies_without_white_king);
if (board.piece_array[BR] & rook_attacks) != 0 {
continue;
}
if (board.piece_array[BQ] & rook_attacks) != 0 {
continue;
}
move_list[move_count][MOVE_STARTING] = white_king_position;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_CAPTURE ;
move_list[move_count][MOVE_PIECE] = WK ;
move_count += 1;
}
if white_king_check_count == 0 {
if board.castle_rights[WKS_CASTLE_RIGHTS] == true {
if white_king_position == E1 {
//king on e1
if (WKS_EMPTY_BITBOARD & combined_occupancies) == 0 {
//f1 and g1 empty
if (board.piece_array[WR] & constants::SQUARE_BBS[H1]) != 0 {
//rook on h1
if is_square_attacked_by_black(F1 , combined_occupancies)
== false
{
if is_square_attacked_by_black(
G1 ,
combined_occupancies,
) == false
{
move_list[move_count][MOVE_STARTING] = E1 ;
move_list[move_count][MOVE_TARGET] = G1 ;
move_list[move_count][MOVE_TAG] = TAG_WCASTLEKS ;
move_list[move_count][MOVE_PIECE] = WK ;
move_count += 1
}
}
}
}
}
}
if board.castle_rights[WQS_CASTLE_RIGHTS] == true {
if white_king_position == E1 {
//king on e1
if (WQS_EMPTY_BITBOARD & combined_occupancies) == 0 {
//f1 and g1 empty
if (board.piece_array[WR] & constants::SQUARE_BBS[A1]) != 0 {
//rook on h1
if is_square_attacked_by_black(C1 , combined_occupancies)
== false
{
if is_square_attacked_by_black(
D1 ,
combined_occupancies,
) == false
{
move_list[move_count][MOVE_STARTING] = E1 ;
move_list[move_count][MOVE_TARGET] = C1 ;
move_list[move_count][MOVE_TAG] = TAG_WCASTLEQS ;
move_list[move_count][MOVE_PIECE] = WK ;
move_count += 1;
}
}
}
}
}
}
}
temp_bitboard = board.piece_array[WN];
while temp_bitboard != 0 {
starting_square = bitscan_forward_separate(temp_bitboard);
temp_bitboard &= temp_bitboard - 1; //removes the knight from that square to not infinitely loop
temp_pin_bitboard = MAX_ULONG;
if pin_number != 0 {
for i in 0..pin_number {
if pin_array[i][PINNED_SQUARE_INDEX] == starting_square {
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS
[white_king_position ]
[pin_array[i][PINNING_PIECE_INDEX] ]
}
}
}
temp_attack = ((constants::KNIGHT_ATTACKS[starting_square ]
& black_occupancies)
& check_bitboard)
& temp_pin_bitboard; //gets knight captures
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_CAPTURE ;
move_list[move_count][MOVE_PIECE] = WN ;
move_count += 1;
}
temp_attack = ((constants::KNIGHT_ATTACKS[starting_square ]
& empty_occupancies)
& check_bitboard)
& temp_pin_bitboard;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_NONE ;
move_list[move_count][MOVE_PIECE] = WN ;
move_count += 1
}
}
temp_bitboard = board.piece_array[WP];
while temp_bitboard != 0 {
starting_square = bitscan_forward_separate(temp_bitboard);
temp_bitboard &= temp_bitboard - 1;
temp_pin_bitboard = MAX_ULONG;
if pin_number != 0 {
for i in 0..pin_number {
if pin_array[i][PINNED_SQUARE_INDEX] == starting_square {
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS
[white_king_position ]
[pin_array[i][PINNING_PIECE_INDEX] ];
}
}
}
if (constants::SQUARE_BBS[(starting_square - 8) ]
& combined_occupancies)
== 0
{
//if up one square is empty
if ((constants::SQUARE_BBS[(starting_square - 8) ]
& check_bitboard)
& temp_pin_bitboard)
!= 0
{
if (constants::SQUARE_BBS[starting_square ] & RANK_7_BITBOARD)
!= 0
{
//if promotion
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = starting_square - 8;
move_list[move_count][MOVE_TAG] = TAG_W_QUEEN_PROMOTION ;
move_list[move_count][MOVE_PIECE] = WP ;
move_count += 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = starting_square - 8;
move_list[move_count][MOVE_TAG] = TAG_W_ROOK_PROMOTION ;
move_list[move_count][MOVE_PIECE] = WP ;
move_count += 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = starting_square - 8;
move_list[move_count][MOVE_TAG] = TAG_W_BISHOP_PROMOTION ;
move_list[move_count][MOVE_PIECE] = WP ;
move_count += 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = starting_square - 8;
move_list[move_count][MOVE_TAG] = TAG_W_KNIGHT_PROMOTION ;
move_list[move_count][MOVE_PIECE] = WP ;
move_count += 1;
} else {
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = starting_square - 8;
move_list[move_count][MOVE_TAG] = TAG_NONE ;
move_list[move_count][MOVE_PIECE] = WP ;
move_count += 1;
}
}
if (constants::SQUARE_BBS[starting_square ] & RANK_2_BITBOARD) != 0
{
//if on rank 2
if ((constants::SQUARE_BBS[(starting_square - 16) ]
& check_bitboard)
& temp_pin_bitboard)
!= 0
{
//if not pinned or
if ((constants::SQUARE_BBS[(starting_square - 16) ])
& combined_occupancies)
== 0
{
//if up two squares and one square are empty
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = starting_square - 16;
move_list[move_count][MOVE_TAG] = TAG_DOUBLE_PAWN_WHITE ;
move_list[move_count][MOVE_PIECE] = WP ;
move_count += 1
}
}
}
}
temp_attack = ((constants::WHITE_PAWN_ATTACKS[starting_square ]
& black_occupancies)
& check_bitboard)
& temp_pin_bitboard; //if black piece diagonal to pawn
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
if (constants::SQUARE_BBS[starting_square ] & RANK_7_BITBOARD) != 0
{
//if promotion
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_W_CAPTURE_QUEEN_PROMOTION ;
move_list[move_count][MOVE_PIECE] = WP ;
move_count += 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_W_CAPTURE_ROOK_PROMOTION ;
move_list[move_count][MOVE_PIECE] = WP ;
move_count += 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_W_CAPTURE_BISHOP_PROMOTION ;
move_list[move_count][MOVE_PIECE] = WP ;
move_count += 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_W_CAPTURE_KNIGHT_PROMOTION ;
move_list[move_count][MOVE_PIECE] = WP ;
move_count += 1;
} else {
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_CAPTURE ;
move_list[move_count][MOVE_PIECE] = WP ;
move_count += 1
}
}
if (constants::SQUARE_BBS[starting_square ] & RANK_5_BITBOARD) != 0 {
//check rank for ep
if board.ep != NO_SQUARE {
if (((constants::WHITE_PAWN_ATTACKS[starting_square ]
& constants::SQUARE_BBS[board.ep ])
& check_bitboard)
& temp_pin_bitboard)
!= 0
{
if (board.piece_array[WK] & RANK_5_BITBOARD) == 0 {
//if no king on rank 5
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = board.ep;
move_list[move_count][MOVE_TAG] = TAG_WHITEEP ;
move_list[move_count][MOVE_PIECE] = WP ;
move_count += 1
} else if (board.piece_array[BR] & RANK_5_BITBOARD) == 0
&& (board.piece_array[BQ] & RANK_5_BITBOARD) == 0
{
// if no b rook or queen on rank 5
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = board.ep;
move_list[move_count][MOVE_TAG] = TAG_WHITEEP ;
move_list[move_count][MOVE_PIECE] = WP ;
move_count += 1;
} else {
//wk and br or bq on rank 5
let mut occupancy_without_ep_pawns: u64 = combined_occupancies
& (!constants::SQUARE_BBS[starting_square ]);
occupancy_without_ep_pawns &=
!constants::SQUARE_BBS[(board.ep + 8) ];
let rook_attacks_from_king: u64 = get_rook_attacks_fast(
white_king_position,
occupancy_without_ep_pawns,
);
if (rook_attacks_from_king & board.piece_array[BR]) == 0 {
if (rook_attacks_from_king & board.piece_array[BQ]) == 0 {
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = board.ep;
move_list[move_count][MOVE_TAG] = TAG_WHITEEP;
move_list[move_count][MOVE_PIECE] = WP ;
move_count += 1;
}
}
}
}
}
}
}
//white rook
temp_bitboard = board.piece_array[WR];
while temp_bitboard != 0 {
starting_square = bitscan_forward_separate(temp_bitboard);
temp_bitboard &= temp_bitboard - 1;
temp_pin_bitboard = MAX_ULONG;
if pin_number != 0 {
for i in 0..pin_number {
if pin_array[i][PINNED_SQUARE_INDEX] == starting_square {
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS
[white_king_position ]
[pin_array[i][PINNING_PIECE_INDEX] ];
}
}
}
let rook_attacks = get_rook_attacks_fast(starting_square, combined_occupancies);
temp_attack =
((rook_attacks & black_occupancies) & check_bitboard) & temp_pin_bitboard;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_CAPTURE ;
move_list[move_count][MOVE_PIECE] = WR ;
move_count += 1;
}
temp_attack =
((rook_attacks & empty_occupancies) & check_bitboard) & temp_pin_bitboard;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_NONE ;
move_list[move_count][MOVE_PIECE] = WR ;
move_count += 1
}
}
//White bishop
temp_bitboard = board.piece_array[WB];
while temp_bitboard != 0 {
starting_square = bitscan_forward_separate(temp_bitboard);
temp_bitboard &= temp_bitboard - 1;
temp_pin_bitboard = MAX_ULONG;
if pin_number != 0 {
for i in 0..pin_number {
if pin_array[i][PINNED_SQUARE_INDEX] == starting_square {
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS
[white_king_position ]
[pin_array[i][PINNING_PIECE_INDEX] ];
}
}
}
let bishop_attacks: u64 =
get_bishop_attacks_fast(starting_square, combined_occupancies);
temp_attack =
((bishop_attacks & black_occupancies) & check_bitboard) & temp_pin_bitboard;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_CAPTURE ;
move_list[move_count][MOVE_PIECE] = WB ;
move_count += 1;
}
temp_attack =
((bishop_attacks & empty_occupancies) & check_bitboard) & temp_pin_bitboard;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_NONE ;
move_list[move_count][MOVE_PIECE] = WB ;
move_count += 1;
}
}
temp_bitboard = board.piece_array[WQ];
while temp_bitboard != 0 {
starting_square = bitscan_forward_separate(temp_bitboard);
temp_bitboard &= temp_bitboard - 1;
temp_pin_bitboard = MAX_ULONG;
if pin_number != 0 {
for i in 0..pin_number {
if pin_array[i][PINNED_SQUARE_INDEX] == starting_square {
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS
[white_king_position ]
[pin_array[i][PINNING_PIECE_INDEX] ];
}
}
}
let mut queen_attacks =
get_rook_attacks_fast(starting_square, combined_occupancies);
queen_attacks |= get_bishop_attacks_fast(starting_square, combined_occupancies);
temp_attack =
((queen_attacks & black_occupancies) & check_bitboard) & temp_pin_bitboard;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_CAPTURE ;
move_list[move_count][MOVE_PIECE] = WQ ;
move_count += 1
}
temp_attack =
((queen_attacks & empty_occupancies) & check_bitboard) & temp_pin_bitboard;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_NONE ;
move_list[move_count][MOVE_PIECE] = WQ ;
move_count += 1;
}
}
}
} else {
//black move
let mut black_king_check_count: u8 = 0;
let black_king_position: usize = bitscan_forward_separate(board.piece_array[BK]);
//pawns
temp_bitboard =
board.piece_array[WP] & constants::BLACK_PAWN_ATTACKS[black_king_position ];
if temp_bitboard != 0 {
let pawn_square = bitscan_forward_separate(temp_bitboard);
if check_bitboard == 0 {
check_bitboard = constants::SQUARE_BBS[pawn_square ];
}
black_king_check_count += 1;
}
//knights
temp_bitboard =
board.piece_array[WN] & constants::KNIGHT_ATTACKS[black_king_position ];
if temp_bitboard != 0 {
let knight_square: usize = bitscan_forward_separate(temp_bitboard);
if check_bitboard == 0 {
check_bitboard = constants::SQUARE_BBS[knight_square ];
}
black_king_check_count += 1;
}
//bishops
let bishop_attacks_checks: u64 =
get_bishop_attacks_fast(black_king_position, white_occupancies);
temp_bitboard = board.piece_array[WB] & bishop_attacks_checks;
while temp_bitboard != 0 {
let piece_square: usize = bitscan_forward_separate(temp_bitboard);
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS[black_king_position ]
[piece_square ]
& black_occupancies;
if temp_pin_bitboard == 0 {
if check_bitboard == 0 {
check_bitboard = constants::INBETWEEN_BITBOARDS
[black_king_position ][piece_square ];
}
black_king_check_count += 1
} else {
let pinned_square: usize = bitscan_forward_separate(temp_pin_bitboard);
temp_pin_bitboard &= temp_pin_bitboard - 1;
if temp_pin_bitboard == 0 {
pin_array[pin_number][PINNED_SQUARE_INDEX] = pinned_square;
pin_array[pin_number][PINNING_PIECE_INDEX] = piece_square;
pin_number += 1;
}
}
temp_bitboard &= temp_bitboard - 1;
}
//queen
temp_bitboard = board.piece_array[WQ] & bishop_attacks_checks;
while temp_bitboard != 0 {
let piece_square: usize = bitscan_forward_separate(temp_bitboard);
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS[black_king_position ]
[piece_square ]
& black_occupancies;
if temp_pin_bitboard == 0 {
if check_bitboard == 0 {
check_bitboard = constants::INBETWEEN_BITBOARDS
[black_king_position ][piece_square ];
}
black_king_check_count += 1;
} else {
let pinned_square: usize = bitscan_forward_separate(temp_pin_bitboard);
temp_pin_bitboard &= temp_pin_bitboard - 1;
if temp_pin_bitboard == 0 {
pin_array[pin_number][PINNED_SQUARE_INDEX] = pinned_square;
pin_array[pin_number][PINNING_PIECE_INDEX] = piece_square;
pin_number += 1;
}
}
temp_bitboard &= temp_bitboard - 1;
}
//rook
let rook_attacks = get_rook_attacks_fast(black_king_position, white_occupancies);
temp_bitboard = board.piece_array[WR] & rook_attacks;
while temp_bitboard != 0 {
let piece_square: usize = bitscan_forward_separate(temp_bitboard);
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS[black_king_position ]
[piece_square ]
& black_occupancies;
if temp_pin_bitboard == 0 {
if check_bitboard == 0 {
check_bitboard = constants::INBETWEEN_BITBOARDS
[black_king_position ][piece_square ];
}
black_king_check_count += 1;
} else {
let pinned_square: usize = bitscan_forward_separate(temp_pin_bitboard);
temp_pin_bitboard &= temp_pin_bitboard - 1;
if temp_pin_bitboard == 0 {
pin_array[pin_number][PINNED_SQUARE_INDEX] = pinned_square;
pin_array[pin_number][PINNING_PIECE_INDEX] = piece_square;
pin_number += 1;
}
}
temp_bitboard &= temp_bitboard - 1;
}
//queen
temp_bitboard = board.piece_array[WQ] & rook_attacks;
while temp_bitboard != 0 {
let piece_square: usize = bitscan_forward_separate(temp_bitboard);
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS[black_king_position ]
[piece_square ]
& black_occupancies;
if temp_pin_bitboard == 0 {
if check_bitboard == 0 {
check_bitboard = constants::INBETWEEN_BITBOARDS
[black_king_position ][piece_square ];
}
black_king_check_count += 1;
} else {
let pinned_square: usize = bitscan_forward_separate(temp_pin_bitboard);
temp_pin_bitboard &= temp_pin_bitboard - 1;
if temp_pin_bitboard == 0 {
pin_array[pin_number][PINNED_SQUARE_INDEX] = pinned_square;
pin_array[pin_number][PINNING_PIECE_INDEX] = piece_square;
pin_number += 1;
}
}
temp_bitboard &= temp_bitboard - 1;
}
if black_king_check_count > 1 {
let occupancy_without_black_king = combined_occupancies & (!board.piece_array[BK]);
temp_attack =
constants::KING_ATTACKS[black_king_position ] & white_occupancies;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
if (board.piece_array[WP] & constants::BLACK_PAWN_ATTACKS[target_square ])
!= 0
{
continue;
}
if (board.piece_array[WN] & constants::KNIGHT_ATTACKS[target_square ]) != 0 {
continue;
}
if (board.piece_array[WK] & constants::KING_ATTACKS[target_square ]) != 0 {
continue;
}
let bishop_attacks =
get_bishop_attacks_fast(target_square, occupancy_without_black_king);
if (board.piece_array[WB] & bishop_attacks) != 0 {
continue;
}
if (board.piece_array[WQ] & bishop_attacks) != 0 {
continue;
}
let rook_attacks =
get_rook_attacks_fast(target_square, occupancy_without_black_king);
if (board.piece_array[WR] & rook_attacks) != 0 {
continue;
}
if (board.piece_array[WQ] & rook_attacks) != 0 {
continue;
}
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_CAPTURE ;
move_list[move_count][MOVE_PIECE] = BK ;
move_count += 1;
}
temp_attack =
constants::KING_ATTACKS[black_king_position ] & !combined_occupancies;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
if (board.piece_array[WP] & constants::WHITE_PAWN_ATTACKS[target_square ])
!= 0
{
continue;
}
if (board.piece_array[WN] & constants::KNIGHT_ATTACKS[target_square ]) != 0 {
continue;
}
if (board.piece_array[WK] & constants::KING_ATTACKS[target_square ]) != 0 {
continue;
}
let bishop_attacks =
get_bishop_attacks_fast(target_square, occupancy_without_black_king);
if (board.piece_array[WB] & bishop_attacks) != 0 {
continue;
}
if (board.piece_array[WQ] & bishop_attacks) != 0 {
continue;
}
let rook_attacks =
get_rook_attacks_fast(target_square, occupancy_without_black_king);
if (board.piece_array[WR] & rook_attacks) != 0 {
continue;
}
if (board.piece_array[WQ] & rook_attacks) != 0 {
continue;
}
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_NONE ;
move_list[move_count][MOVE_PIECE] = BK ;
move_count += 1;
}
} else {
if black_king_check_count == 0 {
check_bitboard = MAX_ULONG;
}
temp_bitboard = board.piece_array[BP];
while temp_bitboard != 0 {
starting_square = bitscan_forward_separate(temp_bitboard);
temp_bitboard &= temp_bitboard - 1;
temp_pin_bitboard = MAX_ULONG;
if pin_number != 0 {
for i in 0..pin_number {
if pin_array[i][PINNED_SQUARE_INDEX] == starting_square {
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS
[black_king_position ]
[pin_array[i][PINNING_PIECE_INDEX] ];
}
}
}
if (constants::SQUARE_BBS[(starting_square + 8) ]
& combined_occupancies)
== 0
{
//if up one square is empty
if ((constants::SQUARE_BBS[(starting_square + 8) ]
& check_bitboard)
& temp_pin_bitboard)
!= 0
{
if (constants::SQUARE_BBS[starting_square ] & RANK_2_BITBOARD)
!= 0
{
//if promotion
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = starting_square + 8;
move_list[move_count][MOVE_TAG] = TAG_B_BISHOP_PROMOTION ;
move_list[move_count][MOVE_PIECE] = BP ;
move_count += 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = starting_square + 8;
move_list[move_count][MOVE_TAG] = TAG_B_KNIGHT_PROMOTION ;
move_list[move_count][MOVE_PIECE] = BP ;
move_count += 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = starting_square + 8;
move_list[move_count][MOVE_TAG] = TAG_B_ROOK_PROMOTION ;
move_list[move_count][MOVE_PIECE] = BP ;
move_count += 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = starting_square + 8;
move_list[move_count][MOVE_TAG] = TAG_B_QUEEN_PROMOTION ;
move_list[move_count][MOVE_PIECE] = BP ;
move_count += 1;
} else {
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = starting_square + 8;
move_list[move_count][MOVE_TAG] = TAG_NONE ;
move_list[move_count][MOVE_PIECE] = BP ;
move_count += 1;
}
}
if (constants::SQUARE_BBS[starting_square ] & RANK_7_BITBOARD) != 0
{
//if on rank 2
if ((constants::SQUARE_BBS[(starting_square + 16) ]
& check_bitboard)
& temp_pin_bitboard)
!= 0
{
if ((constants::SQUARE_BBS[(starting_square + 16) ])
& combined_occupancies)
== 0
{
//if up two squares and one square are empty
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = starting_square + 16;
move_list[move_count][MOVE_TAG] = TAG_DOUBLE_PAWN_BLACK ;
move_list[move_count][MOVE_PIECE] = BP ;
move_count += 1;
}
}
}
}
temp_attack = ((constants::BLACK_PAWN_ATTACKS[starting_square ]
& white_occupancies)
& check_bitboard)
& temp_pin_bitboard; //if black piece diagonal to pawn
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack); //find the bit
temp_attack &= temp_attack - 1;
if (constants::SQUARE_BBS[starting_square ] & RANK_2_BITBOARD) != 0
{
//if promotion
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_B_CAPTURE_BISHOP_PROMOTION ;
move_list[move_count][MOVE_PIECE] = BP ;
move_count += 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_B_CAPTURE_QUEEN_PROMOTION ;
move_list[move_count][MOVE_PIECE] = BP ;
move_count += 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_B_CAPTURE_KNIGHT_PROMOTION ;
move_list[move_count][MOVE_PIECE] = BP ;
move_count += 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_B_CAPTURE_ROOK_PROMOTION ;
move_list[move_count][MOVE_PIECE] = BP ;
move_count += 1;
} else {
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_CAPTURE ;
move_list[move_count][MOVE_PIECE] = BP ;
move_count += 1;
}
}
if (constants::SQUARE_BBS[starting_square ] & RANK_4_BITBOARD) != 0 {
//check rank for ep
if board.ep != NO_SQUARE {
if (((constants::BLACK_PAWN_ATTACKS[starting_square ]
& constants::SQUARE_BBS[board.ep ])
& check_bitboard)
& temp_pin_bitboard)
!= 0
{
if (board.piece_array[BK] & RANK_4_BITBOARD) == 0 {
//if no king on rank 5
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = board.ep;
move_list[move_count][MOVE_TAG] = TAG_BLACKEP ;
move_list[move_count][MOVE_PIECE] = BP ;
move_count += 1
} else if (board.piece_array[WR] & RANK_4_BITBOARD) == 0
&& (board.piece_array[WQ] & RANK_4_BITBOARD) == 0
{
// if no b rook or queen on rank 5
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = board.ep;
move_list[move_count][MOVE_TAG] = TAG_BLACKEP;
move_list[move_count][MOVE_PIECE] = BP ;
move_count += 1;
} else {
//wk and br or bq on rank 5
let mut occupancy_without_ep_pawns: u64 = combined_occupancies
& !constants::SQUARE_BBS[starting_square ];
occupancy_without_ep_pawns &=
!constants::SQUARE_BBS[(board.ep - 8) ];
let rook_attacks_from_king = get_rook_attacks_fast(
black_king_position,
occupancy_without_ep_pawns,
);
if (rook_attacks_from_king & board.piece_array[WR]) == 0 {
if (rook_attacks_from_king & board.piece_array[WQ]) == 0 {
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = board.ep;
move_list[move_count][MOVE_TAG] = TAG_BLACKEP;
move_list[move_count][MOVE_PIECE] = BP ;
move_count += 1;
}
}
}
}
}
}
}
temp_bitboard = board.piece_array[BN];
while temp_bitboard != 0 {
starting_square = bitscan_forward_separate(temp_bitboard); //looks for the startingSquare
temp_bitboard &= temp_bitboard - 1; //removes the knight from that square to not infinitely loop
temp_pin_bitboard = MAX_ULONG;
if pin_number != 0 {
for i in 0..pin_number {
if pin_array[i][PINNED_SQUARE_INDEX] == starting_square {
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS
[black_king_position ]
[pin_array[i][PINNING_PIECE_INDEX] ];
}
}
}
temp_attack = ((constants::KNIGHT_ATTACKS[starting_square ]
& white_occupancies)
& check_bitboard)
& temp_pin_bitboard; //gets knight captures
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_CAPTURE ;
move_list[move_count][MOVE_PIECE] = BN ;
move_count += 1;
}
temp_attack = ((constants::KNIGHT_ATTACKS[starting_square ]
& (!combined_occupancies))
& check_bitboard)
& temp_pin_bitboard;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_NONE ;
move_list[move_count][MOVE_PIECE] = BN ;
move_count += 1;
}
}
temp_bitboard = board.piece_array[BB];
while temp_bitboard != 0 {
starting_square = bitscan_forward_separate(temp_bitboard);
temp_bitboard &= temp_bitboard - 1;
temp_pin_bitboard = MAX_ULONG;
if pin_number != 0 {
for i in 0..pin_number {
if pin_array[i][PINNED_SQUARE_INDEX] == starting_square {
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS
[black_king_position ]
[pin_array[i][PINNING_PIECE_INDEX] ];
}
}
}
let bishop_attacks =
get_bishop_attacks_fast(starting_square, combined_occupancies);
temp_attack =
((bishop_attacks & white_occupancies) & check_bitboard) & temp_pin_bitboard;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_CAPTURE ;
move_list[move_count][MOVE_PIECE] = BB ;
move_count += 1;
}
temp_attack = ((bishop_attacks & (!combined_occupancies)) & check_bitboard)
& temp_pin_bitboard;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_NONE ;
move_list[move_count][MOVE_PIECE] = BB ;
move_count += 1;
}
}
temp_bitboard = board.piece_array[BR];
while temp_bitboard != 0 {
starting_square = bitscan_forward_separate(temp_bitboard);
temp_bitboard &= temp_bitboard - 1;
temp_pin_bitboard = MAX_ULONG;
if pin_number != 0 {
for i in 0..pin_number {
if pin_array[i][PINNED_SQUARE_INDEX] == starting_square {
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS
[black_king_position ]
[pin_array[i][PINNING_PIECE_INDEX] ];
}
}
}
let rook_attacks = get_rook_attacks_fast(starting_square, combined_occupancies);
temp_attack =
((rook_attacks & white_occupancies) & check_bitboard) & temp_pin_bitboard;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_CAPTURE ;
move_list[move_count][MOVE_PIECE] = BR ;
move_count += 1;
}
temp_attack = ((rook_attacks & (!combined_occupancies)) & check_bitboard)
& temp_pin_bitboard;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_NONE ;
move_list[move_count][MOVE_PIECE] = BR ;
move_count += 1;
}
}
temp_bitboard = board.piece_array[BQ];
while temp_bitboard != 0 {
starting_square = bitscan_forward_separate(temp_bitboard);
temp_bitboard &= temp_bitboard - 1;
temp_pin_bitboard = MAX_ULONG;
if pin_number != 0 {
for i in 0..pin_number {
if pin_array[i][PINNED_SQUARE_INDEX] == starting_square {
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS
[black_king_position ]
[pin_array[i][PINNING_PIECE_INDEX] ];
}
}
}
let mut queen_attacks =
get_rook_attacks_fast(starting_square, combined_occupancies);
queen_attacks |= get_bishop_attacks_fast(starting_square, combined_occupancies);
temp_attack =
((queen_attacks & white_occupancies) & check_bitboard) & temp_pin_bitboard;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_CAPTURE ;
move_list[move_count][MOVE_PIECE] = BQ ;
move_count += 1;
}
temp_attack = ((queen_attacks & (!combined_occupancies)) & check_bitboard)
& temp_pin_bitboard;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_NONE ;
move_list[move_count][MOVE_PIECE] = BQ ;
move_count += 1;
}
}
temp_attack =
constants::KING_ATTACKS[black_king_position ] & white_occupancies; //gets knight captures
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
if (board.piece_array[WP] & constants::BLACK_PAWN_ATTACKS[target_square ])
!= 0
{
continue;
}
if (board.piece_array[WN] & constants::KNIGHT_ATTACKS[target_square ]) != 0 {
continue;
}
if (board.piece_array[WK] & constants::KING_ATTACKS[target_square ]) != 0 {
continue;
}
let occupancy_without_black_king = combined_occupancies & (!board.piece_array[BK]);
let bishop_attacks =
get_bishop_attacks_fast(target_square, occupancy_without_black_king);
if (board.piece_array[WB] & bishop_attacks) != 0 {
continue;
}
if (board.piece_array[WQ] & bishop_attacks) != 0 {
continue;
}
let rook_attacks =
get_rook_attacks_fast(target_square, occupancy_without_black_king);
if (board.piece_array[WR] & rook_attacks) != 0 {
continue;
}
if (board.piece_array[WQ] & rook_attacks) != 0 {
continue;
}
move_list[move_count][MOVE_STARTING] = black_king_position;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_CAPTURE ;
move_list[move_count][MOVE_PIECE] = BK ;
move_count += 1
}
temp_attack =
constants::KING_ATTACKS[black_king_position ] & (!combined_occupancies); //get knight moves to emtpy squares
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
if (board.piece_array[WP] & constants::BLACK_PAWN_ATTACKS[target_square ])
!= 0
{
continue;
}
if (board.piece_array[WN] & constants::KNIGHT_ATTACKS[target_square ]) != 0 {
continue;
}
if (board.piece_array[WK] & constants::KING_ATTACKS[target_square ]) != 0 {
continue;
}
let occupancy_without_black_king = combined_occupancies & (!board.piece_array[BK]);
let bishop_attacks =
get_bishop_attacks_fast(target_square, occupancy_without_black_king);
if (board.piece_array[WB] & bishop_attacks) != 0 {
continue;
}
if (board.piece_array[WQ] & bishop_attacks) != 0 {
continue;
}
let rook_attacks =
get_rook_attacks_fast(target_square, occupancy_without_black_king);
if (board.piece_array[WR] & rook_attacks) != 0 {
continue;
}
if (board.piece_array[WQ] & rook_attacks) != 0 {
continue;
}
move_list[move_count][MOVE_STARTING] = black_king_position;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_NONE ;
move_list[move_count][MOVE_PIECE] = BK ;
move_count += 1;
}
}
if black_king_check_count == 0 {
if board.castle_rights[BKS_CASTLE_RIGHTS] == true {
if black_king_position == E8 {
//king on e1
if (BKS_EMPTY_BITBOARD & combined_occupancies) == 0 {
//f1 and g1 empty
if (board.piece_array[BR] & constants::SQUARE_BBS[H8]) != 0 {
//rook on h1
if is_square_attacked_by_white(F8 , combined_occupancies)
== false
{
if is_square_attacked_by_white(G8 , combined_occupancies)
== false
{
move_list[move_count][MOVE_STARTING] = E8 ;
move_list[move_count][MOVE_TARGET] = G8 ;
move_list[move_count][MOVE_TAG] = TAG_BCASTLEKS ;
move_list[move_count][MOVE_PIECE] = BK ;
move_count += 1
}
}
}
}
}
}
if board.castle_rights[BQS_CASTLE_RIGHTS] == true {
if black_king_position == E8 {
//king on e1
if (BQS_EMPTY_BITBOARD & combined_occupancies) == 0 {
//f1 and g1 empty
if (board.piece_array[BR] & constants::SQUARE_BBS[A8]) != 0 {
//rook on h1
if is_square_attacked_by_white(C8 , combined_occupancies)
== false
{
if is_square_attacked_by_white(D8 , combined_occupancies)
== false
{
move_list[move_count][MOVE_STARTING] = E8 ;
move_list[move_count][MOVE_TARGET] = C8 ;
move_list[move_count][MOVE_TAG] = TAG_BCASTLEQS ;
move_list[move_count][MOVE_PIECE] = BK ;
move_count += 1
}
}
}
}
}
}
}
}
if depth == 1 {
return move_count as u64;
}
let mut nodes: u64 = 0;
//let mut prior_nodes: u64;
let copy_ep: usize = board.ep;
let mut copy_castle: [bool; 4] = [true, true, true, true];
copy_castle[0] = board.castle_rights[0];
copy_castle[1] = board.castle_rights[1];
copy_castle[2] = board.castle_rights[2];
copy_castle[3] = board.castle_rights[3];
for move_index in 0..move_count {
let starting_square: usize = move_list[move_index][MOVE_STARTING] ;
let target_square: usize = move_list[move_index][MOVE_TARGET] ;
let piece: usize = move_list[move_index][MOVE_PIECE] ;
let tag: usize = move_list[move_index][MOVE_TAG] ;
let mut capture_index: usize = 0;
board.is_white = !board.is_white;
match tag {
TAG_NONE => {
//none
board.piece_array[piece] |= constants::SQUARE_BBS[target_square];
board.piece_array[piece] &= !constants::SQUARE_BBS[starting_square];
board.ep = NO_SQUARE ;
}
TAG_CAPTURE => {
//capture
board.piece_array[piece] |= constants::SQUARE_BBS[target_square ];
board.piece_array[piece] &= !constants::SQUARE_BBS[starting_square];
if piece <= WK {
for i in BP..BK + 1 {
if (board.piece_array[i] & constants::SQUARE_BBS[target_square ]) != 0
{
capture_index = i;
break;
}
}
board.piece_array[capture_index ] &=
!constants::SQUARE_BBS[target_square ]
} else {
//is black
for i in WP..BP {
if (board.piece_array[i] & constants::SQUARE_BBS[target_square]) != 0 {
capture_index = i;
break;
}
}
board.piece_array[capture_index] &= !constants::SQUARE_BBS[target_square];
}
board.ep = NO_SQUARE ;
}
TAG_WHITEEP => {
//white ep
//move piece
board.piece_array[WP] |= constants::SQUARE_BBS[target_square];
board.piece_array[WP] &= !constants::SQUARE_BBS[starting_square];
//remove
board.piece_array[BP] &= !constants::SQUARE_BBS[target_square + 8];
board.ep = NO_SQUARE ;
}
TAG_BLACKEP => {
//black ep
//move piece
board.piece_array[BP] |= constants::SQUARE_BBS[target_square];
board.piece_array[BP] &= !constants::SQUARE_BBS[starting_square];
//remove white pawn square up
board.piece_array[WP] &= !constants::SQUARE_BBS[target_square - 8];
board.ep = NO_SQUARE ;
}
TAG_WCASTLEKS => {
//WKS
//white king
board.piece_array[WK] |= constants::SQUARE_BBS[G1];
board.piece_array[WK] &= !constants::SQUARE_BBS[E1];
//white rook
board.piece_array[WR] |= constants::SQUARE_BBS[F1];
board.piece_array[WR] &= !constants::SQUARE_BBS[H1];
//occupancies
board.castle_rights[WKS_CASTLE_RIGHTS] = false;
board.castle_rights[WQS_CASTLE_RIGHTS] = false;
board.ep = NO_SQUARE ;
}
TAG_WCASTLEQS => {
//WQS
//white king
board.piece_array[WK] |= constants::SQUARE_BBS[C1];
board.piece_array[WK] &= !constants::SQUARE_BBS[E1];
//white rook
board.piece_array[WR] |= constants::SQUARE_BBS[D1];
board.piece_array[WR] &= !constants::SQUARE_BBS[A1];
board.castle_rights[WKS_CASTLE_RIGHTS] = false;
board.castle_rights[WQS_CASTLE_RIGHTS] = false;
board.ep = NO_SQUARE ;
}
TAG_BCASTLEKS => {
//BKS
//white king
board.piece_array[BK] |= constants::SQUARE_BBS[G8];
board.piece_array[BK] &= !constants::SQUARE_BBS[E8];
//white rook
board.piece_array[BR] |= constants::SQUARE_BBS[F8];
board.piece_array[BR] &= !constants::SQUARE_BBS[H8];
board.castle_rights[BKS_CASTLE_RIGHTS] = false;
board.castle_rights[BQS_CASTLE_RIGHTS] = false;
board.ep = NO_SQUARE ;
}
TAG_BCASTLEQS => {
//BQS
//white king
board.piece_array[BK] |= constants::SQUARE_BBS[C8];
board.piece_array[BK] &= !constants::SQUARE_BBS[E8];
//white rook
board.piece_array[BR] |= constants::SQUARE_BBS[D8];
board.piece_array[BR] &= !constants::SQUARE_BBS[A8];
board.castle_rights[BKS_CASTLE_RIGHTS] = false;
board.castle_rights[BQS_CASTLE_RIGHTS] = false;
board.ep = NO_SQUARE ;
}
TAG_B_KNIGHT_PROMOTION => {
//BNPr
board.piece_array[BN] |= constants::SQUARE_BBS[target_square];
board.piece_array[piece] &= !constants::SQUARE_BBS[starting_square];
board.ep = NO_SQUARE ;
}
TAG_B_BISHOP_PROMOTION => {
//BBPr
board.piece_array[BB] |= constants::SQUARE_BBS[target_square];
board.piece_array[piece] &= !constants::SQUARE_BBS[starting_square];
board.ep = NO_SQUARE ;
}
TAG_B_QUEEN_PROMOTION => {
//BQPr
board.piece_array[BQ] |= constants::SQUARE_BBS[target_square];
board.piece_array[piece] &= !constants::SQUARE_BBS[starting_square];
board.ep = NO_SQUARE ;
}
TAG_B_ROOK_PROMOTION => {
//BRPr
board.piece_array[BR] |= constants::SQUARE_BBS[target_square];
board.piece_array[piece] &= !constants::SQUARE_BBS[starting_square];
board.ep = NO_SQUARE ;
}
TAG_W_KNIGHT_PROMOTION => {
//WNPr
board.piece_array[WN] |= constants::SQUARE_BBS[target_square];
board.piece_array[piece] &= !constants::SQUARE_BBS[starting_square];
board.ep = NO_SQUARE ;
}
TAG_W_BISHOP_PROMOTION => {
//WBPr
board.piece_array[WB] |= constants::SQUARE_BBS[target_square];
board.piece_array[piece] &= !constants::SQUARE_BBS[starting_square];
board.ep = NO_SQUARE ;
}
TAG_W_QUEEN_PROMOTION => {
//WQPr
board.piece_array[WQ] |= constants::SQUARE_BBS[target_square];
board.piece_array[piece] &= !constants::SQUARE_BBS[starting_square];
board.ep = NO_SQUARE ;
}
TAG_W_ROOK_PROMOTION => {
//WRPr
board.piece_array[WR] |= constants::SQUARE_BBS[target_square ];
board.piece_array[piece] &= !constants::SQUARE_BBS[starting_square];
board.ep = NO_SQUARE ;
}
TAG_B_CAPTURE_KNIGHT_PROMOTION => {
//BNPrCAP
board.piece_array[BN] |= constants::SQUARE_BBS[target_square];
board.piece_array[piece] &= !constants::SQUARE_BBS[starting_square];
board.ep = NO_SQUARE ;
for i in WP..BP {
if (board.piece_array[i] & constants::SQUARE_BBS[target_square]) != 0 {
capture_index = i;
break;
}
}
board.piece_array[capture_index] &= !constants::SQUARE_BBS[target_square]
}
TAG_B_CAPTURE_BISHOP_PROMOTION => {
//BBPrCAP
board.piece_array[BB] |= constants::SQUARE_BBS[target_square];
board.piece_array[piece] &= !constants::SQUARE_BBS[starting_square];
board.ep = NO_SQUARE ;
for i in WP..BP {
if (board.piece_array[i] & constants::SQUARE_BBS[target_square]) != 0 {
capture_index = i;
break;
}
}
board.piece_array[capture_index] &= !constants::SQUARE_BBS[target_square];
}
TAG_B_CAPTURE_QUEEN_PROMOTION => {
//BQPrCAP
board.piece_array[BQ] |= constants::SQUARE_BBS[target_square];
board.piece_array[piece] &= !constants::SQUARE_BBS[starting_square];
board.ep = NO_SQUARE ;
for i in WP..BP {
if (board.piece_array[i] & constants::SQUARE_BBS[target_square]) != 0 {
capture_index = i;
break;
}
}
board.piece_array[capture_index] &= !constants::SQUARE_BBS[target_square];
}
TAG_B_CAPTURE_ROOK_PROMOTION => {
//BRPrCAP
board.piece_array[BR] |= constants::SQUARE_BBS[target_square];
board.piece_array[piece] &= !constants::SQUARE_BBS[starting_square];
board.ep = NO_SQUARE ;
for i in WP..BP {
if (board.piece_array[i] & constants::SQUARE_BBS[target_square]) != 0 {
capture_index = i;
break;
}
}
board.piece_array[capture_index] &= !constants::SQUARE_BBS[target_square];
}
TAG_W_CAPTURE_KNIGHT_PROMOTION => {
//WNPrCAP
board.piece_array[WN] |= constants::SQUARE_BBS[target_square];
board.piece_array[piece] &= !constants::SQUARE_BBS[starting_square];
board.ep = NO_SQUARE ;
for i in BP..BK + 1 {
if (board.piece_array[i] & constants::SQUARE_BBS[target_square]) != 0 {
capture_index = i;
break;
}
}
board.piece_array[capture_index] &= !constants::SQUARE_BBS[target_square]
}
TAG_W_CAPTURE_BISHOP_PROMOTION => {
//WBPrCAP
board.piece_array[WB] |= constants::SQUARE_BBS[target_square];
board.piece_array[piece] &= !constants::SQUARE_BBS[starting_square];
board.ep = NO_SQUARE ;
for i in BP..BK + 1 {
if (board.piece_array[i] & constants::SQUARE_BBS[target_square]) != 0 {
capture_index = i;
break;
}
}
board.piece_array[capture_index] &= !constants::SQUARE_BBS[target_square]
}
TAG_W_CAPTURE_QUEEN_PROMOTION => {
//WQPrCAP
board.piece_array[WQ] |= constants::SQUARE_BBS[target_square ];
board.piece_array[piece] &= !constants::SQUARE_BBS[starting_square];
board.ep = NO_SQUARE ;
for i in BP..BK + 1 {
if (board.piece_array[i] & constants::SQUARE_BBS[target_square ]) != 0 {
capture_index = i;
break;
}
}
board.piece_array[capture_index] &= !constants::SQUARE_BBS[target_square];
}
TAG_W_CAPTURE_ROOK_PROMOTION => {
//WRPrCAP
board.piece_array[WR] |= constants::SQUARE_BBS[target_square];
board.piece_array[piece] &= !constants::SQUARE_BBS[starting_square];
board.ep = NO_SQUARE ;
for i in BP..BK + 1 {
if (board.piece_array[i] & constants::SQUARE_BBS[target_square]) != 0 {
capture_index = i;
break;
}
}
board.piece_array[capture_index] &= !constants::SQUARE_BBS[target_square];
}
TAG_DOUBLE_PAWN_WHITE => {
//WDouble
board.piece_array[WP] |= constants::SQUARE_BBS[target_square];
board.piece_array[WP] &= !constants::SQUARE_BBS[starting_square];
board.ep = (target_square + 8) ;
}
TAG_DOUBLE_PAWN_BLACK => {
//BDouble
board.piece_array[BP] |= constants::SQUARE_BBS[target_square];
board.piece_array[BP] &= !constants::SQUARE_BBS[starting_square];
board.ep = (target_square - 8) ;
}
_ => {}
}
if piece == WK {
board.castle_rights[WKS_CASTLE_RIGHTS] = false;
board.castle_rights[WQS_CASTLE_RIGHTS] = false;
} else if piece == BK {
board.castle_rights[BKS_CASTLE_RIGHTS] = false;
board.castle_rights[BQS_CASTLE_RIGHTS] = false;
} else if piece == WR {
if board.castle_rights[WKS_CASTLE_RIGHTS] == true {
if (board.piece_array[WR] & constants::SQUARE_BBS[H1]) == 0 {
board.castle_rights[WKS_CASTLE_RIGHTS] = false;
}
}
if board.castle_rights[WQS_CASTLE_RIGHTS] == true {
if (board.piece_array[WR] & constants::SQUARE_BBS[A1]) == 0 {
board.castle_rights[WQS_CASTLE_RIGHTS] = false;
}
}
} else if piece == BR {
if board.castle_rights[BKS_CASTLE_RIGHTS] == true {
if (board.piece_array[BR] & constants::SQUARE_BBS[H8]) == 0 {
board.castle_rights[BKS_CASTLE_RIGHTS] = false;
}
}
if board.castle_rights[BQS_CASTLE_RIGHTS] == true {
if (board.piece_array[BR] & constants::SQUARE_BBS[A8]) == 0 {
board.castle_rights[BQS_CASTLE_RIGHTS] = false;
}
}
}
//prior_nodes = nodes;
nodes += perft_inline_struct(board ,depth - 1, ply + 1);
board.is_white = !board.is_white;
match tag {
TAG_NONE => {
//none
board.piece_array[piece] |= constants::SQUARE_BBS[starting_square];
board.piece_array[piece] &= !constants::SQUARE_BBS[target_square];
}
TAG_CAPTURE => {
//capture
board.piece_array[piece] |= constants::SQUARE_BBS[starting_square];
board.piece_array[piece] &= !constants::SQUARE_BBS[target_square];
if piece <= WK {
board.piece_array[capture_index] |= constants::SQUARE_BBS[target_square];
} else {
//is black
board.piece_array[capture_index] |= constants::SQUARE_BBS[target_square];
}
}
TAG_WHITEEP => {
//white ep
board.piece_array[WP] |= constants::SQUARE_BBS[starting_square];
board.piece_array[WP] &= !constants::SQUARE_BBS[target_square];
board.piece_array[BP] |= constants::SQUARE_BBS[target_square + 8];
}
TAG_BLACKEP => {
//black ep
board.piece_array[BP] |= constants::SQUARE_BBS[starting_square];
board.piece_array[BP] &= !constants::SQUARE_BBS[target_square];
board.piece_array[WP] |= constants::SQUARE_BBS[target_square - 8];
}
TAG_WCASTLEKS => {
//WKS
//white king
board.piece_array[WK] |= constants::SQUARE_BBS[E1];
board.piece_array[WK] &= !constants::SQUARE_BBS[G1];
//white rook
board.piece_array[WR] |= constants::SQUARE_BBS[H1];
board.piece_array[WR] &= !constants::SQUARE_BBS[F1];
}
TAG_WCASTLEQS => {
//WQS
//white king
board.piece_array[WK] |= constants::SQUARE_BBS[E1];
board.piece_array[WK] &= !constants::SQUARE_BBS[C1];
//white rook
board.piece_array[WR] |= constants::SQUARE_BBS[A1];
board.piece_array[WR] &= !constants::SQUARE_BBS[D1];
}
TAG_BCASTLEKS => {
//BKS
//white king
board.piece_array[BK] |= constants::SQUARE_BBS[E8];
board.piece_array[BK] &= !constants::SQUARE_BBS[G8];
//white rook
board.piece_array[BR] |= constants::SQUARE_BBS[H8];
board.piece_array[BR] &= !constants::SQUARE_BBS[F8];
}
TAG_BCASTLEQS => {
//BQS
//white king
board.piece_array[BK] |= constants::SQUARE_BBS[E8];
board.piece_array[BK] &= !constants::SQUARE_BBS[C8];
//white rook
board.piece_array[BR] |= constants::SQUARE_BBS[A8];
board.piece_array[BR] &= !constants::SQUARE_BBS[D8];
}
TAG_B_KNIGHT_PROMOTION => {
//BNPr
board.piece_array[BP] |= constants::SQUARE_BBS[starting_square];
board.piece_array[BN] &= !constants::SQUARE_BBS[target_square];
}
TAG_B_BISHOP_PROMOTION => {
//BBPr
board.piece_array[BP] |= constants::SQUARE_BBS[starting_square];
board.piece_array[BB] &= !constants::SQUARE_BBS[target_square];
}
TAG_B_QUEEN_PROMOTION => {
//BQPr
board.piece_array[BP] |= constants::SQUARE_BBS[starting_square];
board.piece_array[BQ] &= !constants::SQUARE_BBS[target_square];
}
TAG_B_ROOK_PROMOTION => {
//BRPr
board.piece_array[BP] |= constants::SQUARE_BBS[starting_square];
board.piece_array[BR] &= !constants::SQUARE_BBS[target_square];
}
TAG_W_KNIGHT_PROMOTION => {
//WNPr
board.piece_array[WP] |= constants::SQUARE_BBS[starting_square];
board.piece_array[WN] &= !constants::SQUARE_BBS[target_square];
}
TAG_W_BISHOP_PROMOTION => {
//WBPr
board.piece_array[WP] |= constants::SQUARE_BBS[starting_square];
board.piece_array[WB] &= !constants::SQUARE_BBS[target_square];
}
TAG_W_QUEEN_PROMOTION => {
//WQPr
board.piece_array[WP] |= constants::SQUARE_BBS[starting_square];
board.piece_array[WQ] &= !constants::SQUARE_BBS[target_square];
}
TAG_W_ROOK_PROMOTION => {
//WRPr
board.piece_array[WP] |= constants::SQUARE_BBS[starting_square];
board.piece_array[WR] &= !constants::SQUARE_BBS[target_square];
}
TAG_B_CAPTURE_KNIGHT_PROMOTION => {
//BNPrCAP
board.piece_array[BP] |= constants::SQUARE_BBS[starting_square];
board.piece_array[BN] &= !constants::SQUARE_BBS[target_square];
board.piece_array[capture_index] |= constants::SQUARE_BBS[target_square];
}
TAG_B_CAPTURE_BISHOP_PROMOTION => {
//BBPrCAP
board.piece_array[BP] |= constants::SQUARE_BBS[starting_square];
board.piece_array[BB] &= !constants::SQUARE_BBS[target_square];
board.piece_array[capture_index] |= constants::SQUARE_BBS[target_square];
}
TAG_B_CAPTURE_QUEEN_PROMOTION => {
//BQPrCAP
board.piece_array[BP] |= constants::SQUARE_BBS[starting_square];
board.piece_array[BQ] &= !constants::SQUARE_BBS[target_square];
board.piece_array[capture_index] |= constants::SQUARE_BBS[target_square];
}
TAG_B_CAPTURE_ROOK_PROMOTION => {
//BRPrCAP
board.piece_array[BP] |= constants::SQUARE_BBS[starting_square];
board.piece_array[BR] &= !constants::SQUARE_BBS[target_square];
board.piece_array[capture_index] |= constants::SQUARE_BBS[target_square];
}
TAG_W_CAPTURE_KNIGHT_PROMOTION => {
//WNPrCAP
board.piece_array[WP] |= constants::SQUARE_BBS[starting_square];
board.piece_array[WN] &= !constants::SQUARE_BBS[target_square ];
board.piece_array[capture_index] |= constants::SQUARE_BBS[target_square ];
}
TAG_W_CAPTURE_BISHOP_PROMOTION => {
//WBPrCAP
board.piece_array[WP] |= constants::SQUARE_BBS[starting_square];
board.piece_array[WB] &= !constants::SQUARE_BBS[target_square];
board.piece_array[capture_index] |= constants::SQUARE_BBS[target_square];
}
TAG_W_CAPTURE_QUEEN_PROMOTION => {
//WQPrCAP
board.piece_array[WP] |= constants::SQUARE_BBS[starting_square];
board.piece_array[WQ] &= !constants::SQUARE_BBS[target_square];
board.piece_array[capture_index] |= constants::SQUARE_BBS[target_square];
}
TAG_W_CAPTURE_ROOK_PROMOTION => {
//WRPrCAP
board.piece_array[WP] |= constants::SQUARE_BBS[starting_square];
board.piece_array[WR] &= !constants::SQUARE_BBS[target_square];
board.piece_array[capture_index] |= constants::SQUARE_BBS[target_square];
}
TAG_DOUBLE_PAWN_WHITE => {
//WDouble
board.piece_array[WP] |= constants::SQUARE_BBS[starting_square];
board.piece_array[WP] &= !constants::SQUARE_BBS[target_square];
}
TAG_DOUBLE_PAWN_BLACK => {
//BDouble
board.piece_array[BP] |= constants::SQUARE_BBS[starting_square];
board.piece_array[BP] &= !constants::SQUARE_BBS[target_square];
}
_ => {}
}
board.castle_rights[0] = copy_castle[0];
board.castle_rights[1] = copy_castle[1];
board.castle_rights[2] = copy_castle[2];
board.castle_rights[3] = copy_castle[3];
board.ep = copy_ep;
//if ply == 0 {
// print_move_no_nl(startingSquare, targetSquare, piece);
// println!(": {}", nodes - priorNodes);
//}
}
return nodes;
}
fn run_perft_inline_struct(depth: i32) {
let timestamp_start = Instant::now();
let mut board = Board{
piece_array: [0; 12],
is_white: true,
ep: 0,
castle_rights: [true; 4],
};
set_starting_position_board(&mut board);
let nodes = perft_inline_struct(&mut board, depth, 0);
let elapsed = timestamp_start.elapsed();
println!("Nodes: {}", nodes);
println!("Elapsed time: {:?}", elapsed);
}
fn perft_inline_go(depth: i32, ply: usize) -> u64 {
unsafe {
//if depth <= 0 {
// return 1;
//}
let mut move_list: [[usize; 4]; 220] = [[0; 4]; 220];
let mut move_count: usize = 0;
let white_occupancies: u64 = PIECE_ARRAY[0]
| PIECE_ARRAY[1]
| PIECE_ARRAY[2]
| PIECE_ARRAY[3]
| PIECE_ARRAY[4]
| PIECE_ARRAY[5];
let black_occupancies: u64 = PIECE_ARRAY[6]
| PIECE_ARRAY[7]
| PIECE_ARRAY[8]
| PIECE_ARRAY[9]
| PIECE_ARRAY[10]
| PIECE_ARRAY[11];
let combined_occupancies: u64 = white_occupancies | black_occupancies;
let empty_occupancies: u64 = !combined_occupancies;
let mut temp_bitboard: u64;
let mut check_bitboard: u64 = EMPTY_BITBOARD;
let mut temp_pin_bitboard: u64;
let mut temp_attack: u64;
let mut temp_empty: u64;
let mut temp_captures: u64;
let mut starting_square: usize = NO_SQUARE;
let mut target_square: usize;
let mut pin_array: [[usize; 2]; 8] = [[NO_SQUARE; 2]; 8];
let mut pin_number: usize = 0;
//Generate Moves
if WHITE_TO_PLAY {
let mut white_king_check_count: u8 = 0;
let white_king_position: usize = bitscan_forward_separate(PIECE_ARRAY[WK]);
//pawns
temp_bitboard =
PIECE_ARRAY[BP] & constants::WHITE_PAWN_ATTACKS[white_king_position ];
if temp_bitboard != 0 {
let pawn_square: usize = bitscan_forward_separate(temp_bitboard);
if check_bitboard == 0 {
check_bitboard = constants::SQUARE_BBS[pawn_square ];
}
white_king_check_count += 1;
}
//knights
temp_bitboard =
PIECE_ARRAY[BN] & constants::KNIGHT_ATTACKS[white_king_position ];
if temp_bitboard != 0 {
let knight_square: usize = bitscan_forward_separate(temp_bitboard);
if check_bitboard == 0 {
check_bitboard = constants::SQUARE_BBS[knight_square ];
}
white_king_check_count += 1;
}
//bishops
let bishop_attacks_checks: u64 =
get_bishop_attacks_fast(white_king_position, black_occupancies);
temp_bitboard = PIECE_ARRAY[BB] & bishop_attacks_checks;
while temp_bitboard != 0 {
let piece_square: usize = bitscan_forward_separate(temp_bitboard);
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS[white_king_position ]
[piece_square ]
& white_occupancies;
if temp_pin_bitboard == 0 {
if check_bitboard == 0 {
check_bitboard = constants::INBETWEEN_BITBOARDS
[white_king_position ][piece_square ];
}
white_king_check_count += 1;
} else {
let pinned_square: usize = bitscan_forward_separate(temp_pin_bitboard);
temp_pin_bitboard &= temp_pin_bitboard - 1;
if temp_pin_bitboard == 0 {
pin_array[pin_number][PINNED_SQUARE_INDEX] = pinned_square;
pin_array[pin_number][PINNING_PIECE_INDEX] = piece_square;
pin_number += 1;
}
}
temp_bitboard &= temp_bitboard - 1;
}
//queen
temp_bitboard = PIECE_ARRAY[BQ] & bishop_attacks_checks;
while temp_bitboard != 0 {
let piece_square: usize = bitscan_forward_separate(temp_bitboard);
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS[white_king_position ]
[piece_square ]
& white_occupancies;
if temp_pin_bitboard == 0 {
if check_bitboard == 0 {
check_bitboard = constants::INBETWEEN_BITBOARDS
[white_king_position ][piece_square ];
}
white_king_check_count += 1;
} else {
let pinned_square: usize = bitscan_forward_separate(temp_pin_bitboard);
temp_pin_bitboard &= temp_pin_bitboard - 1;
if temp_pin_bitboard == 0 {
pin_array[pin_number][PINNED_SQUARE_INDEX] = pinned_square;
pin_array[pin_number][PINNING_PIECE_INDEX] = piece_square;
pin_number += 1;
}
}
temp_bitboard &= temp_bitboard - 1
}
//rook
let rook_attacks: u64 = get_rook_attacks_fast(white_king_position, black_occupancies);
temp_bitboard = PIECE_ARRAY[BR] & rook_attacks;
while temp_bitboard != 0 {
let piece_square: usize = bitscan_forward_separate(temp_bitboard);
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS[white_king_position ]
[piece_square ]
& white_occupancies;
if temp_pin_bitboard == 0 {
if check_bitboard == 0 {
check_bitboard = constants::INBETWEEN_BITBOARDS
[white_king_position ][piece_square ];
}
white_king_check_count += 1;
} else {
let pinned_square: usize = bitscan_forward_separate(temp_pin_bitboard);
temp_pin_bitboard &= temp_pin_bitboard - 1;
if temp_pin_bitboard == 0 {
pin_array[pin_number][PINNED_SQUARE_INDEX] = pinned_square;
pin_array[pin_number][PINNING_PIECE_INDEX] = piece_square;
pin_number += 1;
}
}
temp_bitboard &= temp_bitboard - 1;
}
//queen
temp_bitboard = PIECE_ARRAY[BQ] & rook_attacks;
while temp_bitboard != 0 {
let piece_square: usize = bitscan_forward_separate(temp_bitboard);
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS[white_king_position ]
[piece_square ]
& white_occupancies;
if temp_pin_bitboard == 0 {
if check_bitboard == 0 {
check_bitboard = constants::INBETWEEN_BITBOARDS
[white_king_position ][piece_square ];
}
white_king_check_count += 1;
} else {
let pinned_square: usize = bitscan_forward_separate(temp_pin_bitboard);
temp_pin_bitboard &= temp_pin_bitboard - 1;
if temp_pin_bitboard == 0 {
pin_array[pin_number][PINNED_SQUARE_INDEX] = pinned_square;
pin_array[pin_number][PINNING_PIECE_INDEX] = piece_square;
pin_number += 1;
}
}
temp_bitboard &= temp_bitboard - 1;
}
//If double check
if white_king_check_count > 1 {
let occupancies_without_white_king: u64 = combined_occupancies & (!PIECE_ARRAY[WK]);
temp_attack = constants::KING_ATTACKS[white_king_position ];
temp_empty = temp_attack & empty_occupancies;
while temp_empty != 0 {
target_square = bitscan_forward_separate(temp_empty);
temp_empty &= temp_empty - 1;
if (PIECE_ARRAY[BP] & constants::WHITE_PAWN_ATTACKS[target_square ])
!= 0
{
continue;
}
if (PIECE_ARRAY[BN] & constants::KNIGHT_ATTACKS[target_square ]) != 0 {
continue;
}
if (PIECE_ARRAY[BK] & constants::KING_ATTACKS[target_square ]) != 0 {
continue;
}
let bishop_attacks: u64 =
get_bishop_attacks_fast(target_square, occupancies_without_white_king);
if (PIECE_ARRAY[BB] & bishop_attacks) != 0 {
continue;
}
if (PIECE_ARRAY[BQ] & bishop_attacks) != 0 {
continue;
}
let rook_attacks: u64 =
get_rook_attacks_fast(target_square, occupancies_without_white_king);
if (PIECE_ARRAY[BR] & rook_attacks) != 0 {
continue;
}
if (PIECE_ARRAY[BQ] & rook_attacks) != 0 {
continue;
}
move_list[move_count][MOVE_STARTING] = white_king_position;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_NONE;
move_list[move_count][MOVE_PIECE] = WK;
move_count += 1;
}
//captures
temp_captures = temp_attack & black_occupancies;
while temp_captures != 0 {
target_square = bitscan_forward_separate(temp_captures);
temp_captures &= temp_captures - 1;
if (PIECE_ARRAY[BP] & constants::WHITE_PAWN_ATTACKS[target_square ])
!= 0
{
continue;
}
if (PIECE_ARRAY[BN] & constants::KNIGHT_ATTACKS[target_square ]) != 0 {
continue;
}
if (PIECE_ARRAY[BK] & constants::KING_ATTACKS[target_square ]) != 0 {
continue;
}
let bishop_attacks: u64 =
get_bishop_attacks_fast(target_square, occupancies_without_white_king);
if (PIECE_ARRAY[BB] & bishop_attacks) != 0 {
continue;
}
if (PIECE_ARRAY[BQ] & bishop_attacks) != 0 {
continue;
}
let rook_attacks: u64 =
get_rook_attacks_fast(target_square, occupancies_without_white_king);
if (PIECE_ARRAY[BR] & rook_attacks) != 0 {
continue;
}
if (PIECE_ARRAY[BQ] & rook_attacks) != 0 {
continue;
}
move_list[move_count][MOVE_STARTING] = white_king_position;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_CAPTURE;
move_list[move_count][MOVE_PIECE] = WK;
move_count += 1;
}
} else {
if white_king_check_count == 0 {
check_bitboard = MAX_ULONG;
}
let occupancies_without_white_king: u64 = combined_occupancies & (!PIECE_ARRAY[WK]);
temp_attack = constants::KING_ATTACKS[white_king_position ];
temp_empty = temp_attack & empty_occupancies;
while temp_empty != 0 {
target_square = bitscan_forward_separate(temp_empty);
temp_empty &= temp_empty - 1;
if (PIECE_ARRAY[BP] & constants::WHITE_PAWN_ATTACKS[target_square ])
!= 0
{
continue;
}
if (PIECE_ARRAY[BN] & constants::KNIGHT_ATTACKS[target_square ]) != 0 {
continue;
}
if (PIECE_ARRAY[BK] & constants::KING_ATTACKS[target_square ]) != 0 {
continue;
}
let bishop_attacks: u64 =
get_bishop_attacks_fast(target_square, occupancies_without_white_king);
if (PIECE_ARRAY[BB] & bishop_attacks) != 0 {
continue;
}
if (PIECE_ARRAY[BQ] & bishop_attacks) != 0 {
continue;
}
let rook_attacks: u64 =
get_rook_attacks_fast(target_square, occupancies_without_white_king);
if (PIECE_ARRAY[BR] & rook_attacks) != 0 {
continue;
}
if (PIECE_ARRAY[BQ] & rook_attacks) != 0 {
continue;
}
move_list[move_count][MOVE_STARTING] = white_king_position;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_NONE ;
move_list[move_count][MOVE_PIECE] = WK ;
move_count += 1;
}
//captures
temp_captures = temp_attack & black_occupancies;
while temp_captures != 0 {
target_square = bitscan_forward_separate(temp_captures);
temp_captures &= temp_captures - 1;
if (PIECE_ARRAY[BP] & constants::WHITE_PAWN_ATTACKS[target_square ])
!= 0
{
continue;
}
if (PIECE_ARRAY[BN] & constants::KNIGHT_ATTACKS[target_square ]) != 0 {
continue;
}
if (PIECE_ARRAY[BK] & constants::KING_ATTACKS[target_square ]) != 0 {
continue;
}
let bishop_attacks: u64 =
get_bishop_attacks_fast(target_square, occupancies_without_white_king);
if (PIECE_ARRAY[BB] & bishop_attacks) != 0 {
continue;
}
if (PIECE_ARRAY[BQ] & bishop_attacks) != 0 {
continue;
}
let rook_attacks: u64 =
get_rook_attacks_fast(target_square, occupancies_without_white_king);
if (PIECE_ARRAY[BR] & rook_attacks) != 0 {
continue;
}
if (PIECE_ARRAY[BQ] & rook_attacks) != 0 {
continue;
}
move_list[move_count][MOVE_STARTING] = white_king_position;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_CAPTURE ;
move_list[move_count][MOVE_PIECE] = WK ;
move_count += 1;
}
if white_king_check_count == 0 {
if CASTLE_RIGHTS[WKS_CASTLE_RIGHTS] == true {
if white_king_position == E1 {
//king on e1
if (WKS_EMPTY_BITBOARD & combined_occupancies) == 0 {
//f1 and g1 empty
if (PIECE_ARRAY[WR] & constants::SQUARE_BBS[H1]) != 0 {
//rook on h1
if is_square_attacked_by_black(F1 , combined_occupancies)
== false
{
if is_square_attacked_by_black(
G1 ,
combined_occupancies,
) == false
{
move_list[move_count][MOVE_STARTING] = E1 ;
move_list[move_count][MOVE_TARGET] = G1 ;
move_list[move_count][MOVE_TAG] = TAG_WCASTLEKS ;
move_list[move_count][MOVE_PIECE] = WK ;
move_count += 1
}
}
}
}
}
}
if CASTLE_RIGHTS[WQS_CASTLE_RIGHTS] == true {
if white_king_position == E1 {
//king on e1
if (WQS_EMPTY_BITBOARD & combined_occupancies) == 0 {
//f1 and g1 empty
if (PIECE_ARRAY[WR] & constants::SQUARE_BBS[A1]) != 0 {
//rook on h1
if is_square_attacked_by_black(C1 , combined_occupancies)
== false
{
if is_square_attacked_by_black(
D1 ,
combined_occupancies,
) == false
{
move_list[move_count][MOVE_STARTING] = E1 ;
move_list[move_count][MOVE_TARGET] = C1 ;
move_list[move_count][MOVE_TAG] = TAG_WCASTLEQS ;
move_list[move_count][MOVE_PIECE] = WK ;
move_count += 1;
}
}
}
}
}
}
}
temp_bitboard = PIECE_ARRAY[WN];
while temp_bitboard != 0 {
starting_square = bitscan_forward_separate(temp_bitboard);
temp_bitboard &= temp_bitboard - 1; //removes the knight from that square to not infinitely loop
temp_pin_bitboard = MAX_ULONG;
if pin_number != 0 {
for i in 0..pin_number {
if pin_array[i][PINNED_SQUARE_INDEX] == starting_square {
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS
[white_king_position ]
[pin_array[i][PINNING_PIECE_INDEX] ]
}
}
}
temp_attack = ((constants::KNIGHT_ATTACKS[starting_square ]
& black_occupancies)
& check_bitboard)
& temp_pin_bitboard; //gets knight captures
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_CAPTURE ;
move_list[move_count][MOVE_PIECE] = WN ;
move_count += 1;
}
temp_attack = ((constants::KNIGHT_ATTACKS[starting_square ]
& empty_occupancies)
& check_bitboard)
& temp_pin_bitboard;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_NONE ;
move_list[move_count][MOVE_PIECE] = WN ;
move_count += 1
}
}
temp_bitboard = PIECE_ARRAY[WP];
while temp_bitboard != 0 {
starting_square = bitscan_forward_separate(temp_bitboard);
temp_bitboard &= temp_bitboard - 1;
temp_pin_bitboard = MAX_ULONG;
if pin_number != 0 {
for i in 0..pin_number {
if pin_array[i][PINNED_SQUARE_INDEX] == starting_square {
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS
[white_king_position ]
[pin_array[i][PINNING_PIECE_INDEX] ];
}
}
}
if (constants::SQUARE_BBS[(starting_square - 8) ]
& combined_occupancies)
== 0
{
//if up one square is empty
if ((constants::SQUARE_BBS[(starting_square - 8) ]
& check_bitboard)
& temp_pin_bitboard)
!= 0
{
if (constants::SQUARE_BBS[starting_square ] & RANK_7_BITBOARD)
!= 0
{
//if promotion
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = starting_square - 8;
move_list[move_count][MOVE_TAG] = TAG_W_QUEEN_PROMOTION ;
move_list[move_count][MOVE_PIECE] = WP ;
move_count += 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = starting_square - 8;
move_list[move_count][MOVE_TAG] = TAG_W_ROOK_PROMOTION ;
move_list[move_count][MOVE_PIECE] = WP ;
move_count += 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = starting_square - 8;
move_list[move_count][MOVE_TAG] = TAG_W_BISHOP_PROMOTION ;
move_list[move_count][MOVE_PIECE] = WP ;
move_count += 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = starting_square - 8;
move_list[move_count][MOVE_TAG] = TAG_W_KNIGHT_PROMOTION ;
move_list[move_count][MOVE_PIECE] = WP ;
move_count += 1;
} else {
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = starting_square - 8;
move_list[move_count][MOVE_TAG] = TAG_NONE ;
move_list[move_count][MOVE_PIECE] = WP ;
move_count += 1;
}
}
if (constants::SQUARE_BBS[starting_square ] & RANK_2_BITBOARD) != 0
{
//if on rank 2
if ((constants::SQUARE_BBS[(starting_square - 16) ]
& check_bitboard)
& temp_pin_bitboard)
!= 0
{
//if not pinned or
if ((constants::SQUARE_BBS[(starting_square - 16) ])
& combined_occupancies)
== 0
{
//if up two squares and one square are empty
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = starting_square - 16;
move_list[move_count][MOVE_TAG] = TAG_DOUBLE_PAWN_WHITE ;
move_list[move_count][MOVE_PIECE] = WP ;
move_count += 1
}
}
}
}
temp_attack = ((constants::WHITE_PAWN_ATTACKS[starting_square ]
& black_occupancies)
& check_bitboard)
& temp_pin_bitboard; //if black piece diagonal to pawn
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
if (constants::SQUARE_BBS[starting_square ] & RANK_7_BITBOARD) != 0
{
//if promotion
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_W_CAPTURE_QUEEN_PROMOTION ;
move_list[move_count][MOVE_PIECE] = WP ;
move_count += 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_W_CAPTURE_ROOK_PROMOTION ;
move_list[move_count][MOVE_PIECE] = WP ;
move_count += 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_W_CAPTURE_BISHOP_PROMOTION ;
move_list[move_count][MOVE_PIECE] = WP ;
move_count += 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_W_CAPTURE_KNIGHT_PROMOTION ;
move_list[move_count][MOVE_PIECE] = WP ;
move_count += 1;
} else {
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_CAPTURE ;
move_list[move_count][MOVE_PIECE] = WP ;
move_count += 1
}
}
if (constants::SQUARE_BBS[starting_square ] & RANK_5_BITBOARD) != 0 {
//check rank for ep
if EP != NO_SQUARE {
if (((constants::WHITE_PAWN_ATTACKS[starting_square ]
& constants::SQUARE_BBS[EP ])
& check_bitboard)
& temp_pin_bitboard)
!= 0
{
if (PIECE_ARRAY[WK] & RANK_5_BITBOARD) == 0 {
//if no king on rank 5
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = EP;
move_list[move_count][MOVE_TAG] = TAG_WHITEEP ;
move_list[move_count][MOVE_PIECE] = WP ;
move_count += 1
} else if (PIECE_ARRAY[BR] & RANK_5_BITBOARD) == 0
&& (PIECE_ARRAY[BQ] & RANK_5_BITBOARD) == 0
{
// if no b rook or queen on rank 5
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = EP;
move_list[move_count][MOVE_TAG] = TAG_WHITEEP ;
move_list[move_count][MOVE_PIECE] = WP ;
move_count += 1;
} else {
//wk and br or bq on rank 5
let mut occupancy_without_ep_pawns: u64 = combined_occupancies
& (!constants::SQUARE_BBS[starting_square ]);
occupancy_without_ep_pawns &=
!constants::SQUARE_BBS[(EP + 8) ];
let rook_attacks_from_king: u64 = get_rook_attacks_fast(
white_king_position,
occupancy_without_ep_pawns,
);
if (rook_attacks_from_king & PIECE_ARRAY[BR]) == 0 {
if (rook_attacks_from_king & PIECE_ARRAY[BQ]) == 0 {
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = EP;
move_list[move_count][MOVE_TAG] = TAG_WHITEEP ;
move_list[move_count][MOVE_PIECE] = WP ;
move_count += 1;
}
}
}
}
}
}
}
//white rook
temp_bitboard = PIECE_ARRAY[WR];
while temp_bitboard != 0 {
starting_square = bitscan_forward_separate(temp_bitboard);
temp_bitboard &= temp_bitboard - 1;
temp_pin_bitboard = MAX_ULONG;
if pin_number != 0 {
for i in 0..pin_number {
if pin_array[i][PINNED_SQUARE_INDEX] == starting_square {
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS
[white_king_position ]
[pin_array[i][PINNING_PIECE_INDEX] ];
}
}
}
let rook_attacks = get_rook_attacks_fast(starting_square, combined_occupancies);
temp_attack =
((rook_attacks & black_occupancies) & check_bitboard) & temp_pin_bitboard;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_CAPTURE ;
move_list[move_count][MOVE_PIECE] = WR ;
move_count += 1;
}
temp_attack =
((rook_attacks & empty_occupancies) & check_bitboard) & temp_pin_bitboard;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_NONE ;
move_list[move_count][MOVE_PIECE] = WR ;
move_count += 1
}
}
//White bishop
temp_bitboard = PIECE_ARRAY[WB];
while temp_bitboard != 0 {
starting_square = bitscan_forward_separate(temp_bitboard);
temp_bitboard &= temp_bitboard - 1;
temp_pin_bitboard = MAX_ULONG;
if pin_number != 0 {
for i in 0..pin_number {
if pin_array[i][PINNED_SQUARE_INDEX] == starting_square {
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS
[white_king_position ]
[pin_array[i][PINNING_PIECE_INDEX] ];
}
}
}
let bishop_attacks: u64 =
get_bishop_attacks_fast(starting_square, combined_occupancies);
temp_attack =
((bishop_attacks & black_occupancies) & check_bitboard) & temp_pin_bitboard;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_CAPTURE ;
move_list[move_count][MOVE_PIECE] = WB ;
move_count += 1;
}
temp_attack =
((bishop_attacks & empty_occupancies) & check_bitboard) & temp_pin_bitboard;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_NONE ;
move_list[move_count][MOVE_PIECE] = WB ;
move_count += 1;
}
}
temp_bitboard = PIECE_ARRAY[WQ];
while temp_bitboard != 0 {
starting_square = bitscan_forward_separate(temp_bitboard);
temp_bitboard &= temp_bitboard - 1;
temp_pin_bitboard = MAX_ULONG;
if pin_number != 0 {
for i in 0..pin_number {
if pin_array[i][PINNED_SQUARE_INDEX] == starting_square {
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS
[white_king_position ]
[pin_array[i][PINNING_PIECE_INDEX] ];
}
}
}
let mut queen_attacks =
get_rook_attacks_fast(starting_square, combined_occupancies);
queen_attacks |= get_bishop_attacks_fast(starting_square, combined_occupancies);
temp_attack =
((queen_attacks & black_occupancies) & check_bitboard) & temp_pin_bitboard;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_CAPTURE ;
move_list[move_count][MOVE_PIECE] = WQ ;
move_count += 1
}
temp_attack =
((queen_attacks & empty_occupancies) & check_bitboard) & temp_pin_bitboard;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_NONE ;
move_list[move_count][MOVE_PIECE] = WQ ;
move_count += 1;
}
}
}
} else {
//black move
let mut black_king_check_count: u8 = 0;
let black_king_position: usize = bitscan_forward_separate(PIECE_ARRAY[BK]);
//pawns
temp_bitboard =
PIECE_ARRAY[WP] & constants::BLACK_PAWN_ATTACKS[black_king_position ];
if temp_bitboard != 0 {
let pawn_square = bitscan_forward_separate(temp_bitboard);
if check_bitboard == 0 {
check_bitboard = constants::SQUARE_BBS[pawn_square ];
}
black_king_check_count += 1;
}
//knights
temp_bitboard =
PIECE_ARRAY[WN] & constants::KNIGHT_ATTACKS[black_king_position ];
if temp_bitboard != 0 {
let knight_square: usize = bitscan_forward_separate(temp_bitboard);
if check_bitboard == 0 {
check_bitboard = constants::SQUARE_BBS[knight_square ];
}
black_king_check_count += 1;
}
//bishops
let bishop_attacks_checks: u64 =
get_bishop_attacks_fast(black_king_position, white_occupancies);
temp_bitboard = PIECE_ARRAY[WB] & bishop_attacks_checks;
while temp_bitboard != 0 {
let piece_square: usize = bitscan_forward_separate(temp_bitboard);
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS[black_king_position ]
[piece_square ]
& black_occupancies;
if temp_pin_bitboard == 0 {
if check_bitboard == 0 {
check_bitboard = constants::INBETWEEN_BITBOARDS
[black_king_position ][piece_square ];
}
black_king_check_count += 1
} else {
let pinned_square: usize = bitscan_forward_separate(temp_pin_bitboard);
temp_pin_bitboard &= temp_pin_bitboard - 1;
if temp_pin_bitboard == 0 {
pin_array[pin_number][PINNED_SQUARE_INDEX] = pinned_square;
pin_array[pin_number][PINNING_PIECE_INDEX] = piece_square;
pin_number += 1;
}
}
temp_bitboard &= temp_bitboard - 1;
}
//queen
temp_bitboard = PIECE_ARRAY[WQ] & bishop_attacks_checks;
while temp_bitboard != 0 {
let piece_square: usize = bitscan_forward_separate(temp_bitboard);
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS[black_king_position ]
[piece_square ]
& black_occupancies;
if temp_pin_bitboard == 0 {
if check_bitboard == 0 {
check_bitboard = constants::INBETWEEN_BITBOARDS
[black_king_position ][piece_square ];
}
black_king_check_count += 1;
} else {
let pinned_square: usize = bitscan_forward_separate(temp_pin_bitboard);
temp_pin_bitboard &= temp_pin_bitboard - 1;
if temp_pin_bitboard == 0 {
pin_array[pin_number][PINNED_SQUARE_INDEX] = pinned_square;
pin_array[pin_number][PINNING_PIECE_INDEX] = piece_square;
pin_number += 1;
}
}
temp_bitboard &= temp_bitboard - 1;
}
//rook
let rook_attacks = get_rook_attacks_fast(black_king_position, white_occupancies);
temp_bitboard = PIECE_ARRAY[WR] & rook_attacks;
while temp_bitboard != 0 {
let piece_square: usize = bitscan_forward_separate(temp_bitboard);
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS[black_king_position ]
[piece_square ]
& black_occupancies;
if temp_pin_bitboard == 0 {
if check_bitboard == 0 {
check_bitboard = constants::INBETWEEN_BITBOARDS
[black_king_position ][piece_square ];
}
black_king_check_count += 1;
} else {
let pinned_square: usize = bitscan_forward_separate(temp_pin_bitboard);
temp_pin_bitboard &= temp_pin_bitboard - 1;
if temp_pin_bitboard == 0 {
pin_array[pin_number][PINNED_SQUARE_INDEX] = pinned_square;
pin_array[pin_number][PINNING_PIECE_INDEX] = piece_square;
pin_number += 1;
}
}
temp_bitboard &= temp_bitboard - 1;
}
//queen
temp_bitboard = PIECE_ARRAY[WQ] & rook_attacks;
while temp_bitboard != 0 {
let piece_square: usize = bitscan_forward_separate(temp_bitboard);
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS[black_king_position ]
[piece_square ]
& black_occupancies;
if temp_pin_bitboard == 0 {
if check_bitboard == 0 {
check_bitboard = constants::INBETWEEN_BITBOARDS
[black_king_position ][piece_square ];
}
black_king_check_count += 1;
} else {
let pinned_square: usize = bitscan_forward_separate(temp_pin_bitboard);
temp_pin_bitboard &= temp_pin_bitboard - 1;
if temp_pin_bitboard == 0 {
pin_array[pin_number][PINNED_SQUARE_INDEX] = pinned_square;
pin_array[pin_number][PINNING_PIECE_INDEX] = piece_square;
pin_number += 1;
}
}
temp_bitboard &= temp_bitboard - 1;
}
if black_king_check_count > 1 {
let occupancy_without_black_king = combined_occupancies & (!PIECE_ARRAY[BK]);
temp_attack =
constants::KING_ATTACKS[black_king_position ] & white_occupancies;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
if (PIECE_ARRAY[WP] & constants::BLACK_PAWN_ATTACKS[target_square ])
!= 0
{
continue;
}
if (PIECE_ARRAY[WN] & constants::KNIGHT_ATTACKS[target_square ]) != 0 {
continue;
}
if (PIECE_ARRAY[WK] & constants::KING_ATTACKS[target_square ]) != 0 {
continue;
}
let bishop_attacks =
get_bishop_attacks_fast(target_square, occupancy_without_black_king);
if (PIECE_ARRAY[WB] & bishop_attacks) != 0 {
continue;
}
if (PIECE_ARRAY[WQ] & bishop_attacks) != 0 {
continue;
}
let rook_attacks =
get_rook_attacks_fast(target_square, occupancy_without_black_king);
if (PIECE_ARRAY[WR] & rook_attacks) != 0 {
continue;
}
if (PIECE_ARRAY[WQ] & rook_attacks) != 0 {
continue;
}
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_CAPTURE ;
move_list[move_count][MOVE_PIECE] = BK ;
move_count += 1;
}
temp_attack =
constants::KING_ATTACKS[black_king_position ] & !combined_occupancies;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
if (PIECE_ARRAY[WP] & constants::WHITE_PAWN_ATTACKS[target_square ])
!= 0
{
continue;
}
if (PIECE_ARRAY[WN] & constants::KNIGHT_ATTACKS[target_square ]) != 0 {
continue;
}
if (PIECE_ARRAY[WK] & constants::KING_ATTACKS[target_square ]) != 0 {
continue;
}
let bishop_attacks =
get_bishop_attacks_fast(target_square, occupancy_without_black_king);
if (PIECE_ARRAY[WB] & bishop_attacks) != 0 {
continue;
}
if (PIECE_ARRAY[WQ] & bishop_attacks) != 0 {
continue;
}
let rook_attacks =
get_rook_attacks_fast(target_square, occupancy_without_black_king);
if (PIECE_ARRAY[WR] & rook_attacks) != 0 {
continue;
}
if (PIECE_ARRAY[WQ] & rook_attacks) != 0 {
continue;
}
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_NONE ;
move_list[move_count][MOVE_PIECE] = BK ;
move_count += 1;
}
} else {
if black_king_check_count == 0 {
check_bitboard = MAX_ULONG;
}
temp_bitboard = PIECE_ARRAY[BP];
while temp_bitboard != 0 {
starting_square = bitscan_forward_separate(temp_bitboard);
temp_bitboard &= temp_bitboard - 1;
temp_pin_bitboard = MAX_ULONG;
if pin_number != 0 {
for i in 0..pin_number {
if pin_array[i][PINNED_SQUARE_INDEX] == starting_square {
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS
[black_king_position ]
[pin_array[i][PINNING_PIECE_INDEX] ];
}
}
}
if (constants::SQUARE_BBS[(starting_square + 8) ]
& combined_occupancies)
== 0
{
//if up one square is empty
if ((constants::SQUARE_BBS[(starting_square + 8) ]
& check_bitboard)
& temp_pin_bitboard)
!= 0
{
if (constants::SQUARE_BBS[starting_square ] & RANK_2_BITBOARD)
!= 0
{
//if promotion
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = starting_square + 8;
move_list[move_count][MOVE_TAG] = TAG_B_BISHOP_PROMOTION ;
move_list[move_count][MOVE_PIECE] = BP ;
move_count += 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = starting_square + 8;
move_list[move_count][MOVE_TAG] = TAG_B_KNIGHT_PROMOTION ;
move_list[move_count][MOVE_PIECE] = BP ;
move_count += 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = starting_square + 8;
move_list[move_count][MOVE_TAG] = TAG_B_ROOK_PROMOTION ;
move_list[move_count][MOVE_PIECE] = BP ;
move_count += 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = starting_square + 8;
move_list[move_count][MOVE_TAG] = TAG_B_QUEEN_PROMOTION ;
move_list[move_count][MOVE_PIECE] = BP ;
move_count += 1;
} else {
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = starting_square + 8;
move_list[move_count][MOVE_TAG] = TAG_NONE ;
move_list[move_count][MOVE_PIECE] = BP ;
move_count += 1;
}
}
if (constants::SQUARE_BBS[starting_square ] & RANK_7_BITBOARD) != 0
{
//if on rank 2
if ((constants::SQUARE_BBS[(starting_square + 16) ]
& check_bitboard)
& temp_pin_bitboard)
!= 0
{
if ((constants::SQUARE_BBS[(starting_square + 16) ])
& combined_occupancies)
== 0
{
//if up two squares and one square are empty
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = starting_square + 16;
move_list[move_count][MOVE_TAG] = TAG_DOUBLE_PAWN_BLACK ;
move_list[move_count][MOVE_PIECE] = BP ;
move_count += 1;
}
}
}
}
temp_attack = ((constants::BLACK_PAWN_ATTACKS[starting_square ]
& white_occupancies)
& check_bitboard)
& temp_pin_bitboard; //if black piece diagonal to pawn
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack); //find the bit
temp_attack &= temp_attack - 1;
if (constants::SQUARE_BBS[starting_square ] & RANK_2_BITBOARD) != 0
{
//if promotion
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_B_CAPTURE_BISHOP_PROMOTION ;
move_list[move_count][MOVE_PIECE] = BP ;
move_count += 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_B_CAPTURE_QUEEN_PROMOTION ;
move_list[move_count][MOVE_PIECE] = BP ;
move_count += 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_B_CAPTURE_KNIGHT_PROMOTION ;
move_list[move_count][MOVE_PIECE] = BP ;
move_count += 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_B_CAPTURE_ROOK_PROMOTION ;
move_list[move_count][MOVE_PIECE] = BP ;
move_count += 1;
} else {
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_CAPTURE ;
move_list[move_count][MOVE_PIECE] = BP ;
move_count += 1;
}
}
if (constants::SQUARE_BBS[starting_square ] & RANK_4_BITBOARD) != 0 {
//check rank for ep
if EP != NO_SQUARE {
if (((constants::BLACK_PAWN_ATTACKS[starting_square ]
& constants::SQUARE_BBS[EP ])
& check_bitboard)
& temp_pin_bitboard)
!= 0
{
if (PIECE_ARRAY[BK] & RANK_4_BITBOARD) == 0 {
//if no king on rank 5
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = EP;
move_list[move_count][MOVE_TAG] = TAG_BLACKEP ;
move_list[move_count][MOVE_PIECE] = BP ;
move_count += 1
} else if (PIECE_ARRAY[WR] & RANK_4_BITBOARD) == 0
&& (PIECE_ARRAY[WQ] & RANK_4_BITBOARD) == 0
{
// if no b rook or queen on rank 5
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = EP;
move_list[move_count][MOVE_TAG] = TAG_BLACKEP ;
move_list[move_count][MOVE_PIECE] = BP ;
move_count += 1;
} else {
//wk and br or bq on rank 5
let mut occupancy_without_ep_pawns: u64 = combined_occupancies
& !constants::SQUARE_BBS[starting_square ];
occupancy_without_ep_pawns &=
!constants::SQUARE_BBS[(EP - 8) ];
let rook_attacks_from_king = get_rook_attacks_fast(
black_king_position,
occupancy_without_ep_pawns,
);
if (rook_attacks_from_king & PIECE_ARRAY[WR]) == 0 {
if (rook_attacks_from_king & PIECE_ARRAY[WQ]) == 0 {
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = EP;
move_list[move_count][MOVE_TAG] = TAG_BLACKEP ;
move_list[move_count][MOVE_PIECE] = BP ;
move_count += 1;
}
}
}
}
}
}
}
temp_bitboard = PIECE_ARRAY[BN];
while temp_bitboard != 0 {
starting_square = bitscan_forward_separate(temp_bitboard); //looks for the startingSquare
temp_bitboard &= temp_bitboard - 1; //removes the knight from that square to not infinitely loop
temp_pin_bitboard = MAX_ULONG;
if pin_number != 0 {
for i in 0..pin_number {
if pin_array[i][PINNED_SQUARE_INDEX] == starting_square {
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS
[black_king_position ]
[pin_array[i][PINNING_PIECE_INDEX] ];
}
}
}
temp_attack = ((constants::KNIGHT_ATTACKS[starting_square ]
& white_occupancies)
& check_bitboard)
& temp_pin_bitboard; //gets knight captures
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_CAPTURE ;
move_list[move_count][MOVE_PIECE] = BN ;
move_count += 1;
}
temp_attack = ((constants::KNIGHT_ATTACKS[starting_square ]
& (!combined_occupancies))
& check_bitboard)
& temp_pin_bitboard;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_NONE ;
move_list[move_count][MOVE_PIECE] = BN ;
move_count += 1;
}
}
temp_bitboard = PIECE_ARRAY[BB];
while temp_bitboard != 0 {
starting_square = bitscan_forward_separate(temp_bitboard);
temp_bitboard &= temp_bitboard - 1;
temp_pin_bitboard = MAX_ULONG;
if pin_number != 0 {
for i in 0..pin_number {
if pin_array[i][PINNED_SQUARE_INDEX] == starting_square {
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS
[black_king_position ]
[pin_array[i][PINNING_PIECE_INDEX] ];
}
}
}
let bishop_attacks =
get_bishop_attacks_fast(starting_square, combined_occupancies);
temp_attack =
((bishop_attacks & white_occupancies) & check_bitboard) & temp_pin_bitboard;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_CAPTURE ;
move_list[move_count][MOVE_PIECE] = BB ;
move_count += 1;
}
temp_attack = ((bishop_attacks & (!combined_occupancies)) & check_bitboard)
& temp_pin_bitboard;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_NONE ;
move_list[move_count][MOVE_PIECE] = BB ;
move_count += 1;
}
}
temp_bitboard = PIECE_ARRAY[BR];
while temp_bitboard != 0 {
starting_square = bitscan_forward_separate(temp_bitboard);
temp_bitboard &= temp_bitboard - 1;
temp_pin_bitboard = MAX_ULONG;
if pin_number != 0 {
for i in 0..pin_number {
if pin_array[i][PINNED_SQUARE_INDEX] == starting_square {
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS
[black_king_position ]
[pin_array[i][PINNING_PIECE_INDEX] ];
}
}
}
let rook_attacks = get_rook_attacks_fast(starting_square, combined_occupancies);
temp_attack =
((rook_attacks & white_occupancies) & check_bitboard) & temp_pin_bitboard;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_CAPTURE ;
move_list[move_count][MOVE_PIECE] = BR ;
move_count += 1;
}
temp_attack = ((rook_attacks & (!combined_occupancies)) & check_bitboard)
& temp_pin_bitboard;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_NONE ;
move_list[move_count][MOVE_PIECE] = BR ;
move_count += 1;
}
}
temp_bitboard = PIECE_ARRAY[BQ];
while temp_bitboard != 0 {
starting_square = bitscan_forward_separate(temp_bitboard);
temp_bitboard &= temp_bitboard - 1;
temp_pin_bitboard = MAX_ULONG;
if pin_number != 0 {
for i in 0..pin_number {
if pin_array[i][PINNED_SQUARE_INDEX] == starting_square {
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS
[black_king_position ]
[pin_array[i][PINNING_PIECE_INDEX] ];
}
}
}
let mut queen_attacks =
get_rook_attacks_fast(starting_square, combined_occupancies);
queen_attacks |= get_bishop_attacks_fast(starting_square, combined_occupancies);
temp_attack =
((queen_attacks & white_occupancies) & check_bitboard) & temp_pin_bitboard;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_CAPTURE ;
move_list[move_count][MOVE_PIECE] = BQ ;
move_count += 1;
}
temp_attack = ((queen_attacks & (!combined_occupancies)) & check_bitboard)
& temp_pin_bitboard;
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
move_list[move_count][MOVE_STARTING] = starting_square;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_NONE ;
move_list[move_count][MOVE_PIECE] = BQ ;
move_count += 1;
}
}
temp_attack =
constants::KING_ATTACKS[black_king_position ] & white_occupancies; //gets knight captures
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
if (PIECE_ARRAY[WP] & constants::BLACK_PAWN_ATTACKS[target_square ])
!= 0
{
continue;
}
if (PIECE_ARRAY[WN] & constants::KNIGHT_ATTACKS[target_square ]) != 0 {
continue;
}
if (PIECE_ARRAY[WK] & constants::KING_ATTACKS[target_square ]) != 0 {
continue;
}
let occupancy_without_black_king = combined_occupancies & (!PIECE_ARRAY[BK]);
let bishop_attacks =
get_bishop_attacks_fast(target_square, occupancy_without_black_king);
if (PIECE_ARRAY[WB] & bishop_attacks) != 0 {
continue;
}
if (PIECE_ARRAY[WQ] & bishop_attacks) != 0 {
continue;
}
let rook_attacks =
get_rook_attacks_fast(target_square, occupancy_without_black_king);
if (PIECE_ARRAY[WR] & rook_attacks) != 0 {
continue;
}
if (PIECE_ARRAY[WQ] & rook_attacks) != 0 {
continue;
}
move_list[move_count][MOVE_STARTING] = black_king_position;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_CAPTURE ;
move_list[move_count][MOVE_PIECE] = BK ;
move_count += 1
}
temp_attack =
constants::KING_ATTACKS[black_king_position ] & (!combined_occupancies); //get knight moves to emtpy squares
while temp_attack != 0 {
target_square = bitscan_forward_separate(temp_attack);
temp_attack &= temp_attack - 1;
if (PIECE_ARRAY[WP] & constants::BLACK_PAWN_ATTACKS[target_square ])
!= 0
{
continue;
}
if (PIECE_ARRAY[WN] & constants::KNIGHT_ATTACKS[target_square ]) != 0 {
continue;
}
if (PIECE_ARRAY[WK] & constants::KING_ATTACKS[target_square ]) != 0 {
continue;
}
let occupancy_without_black_king = combined_occupancies & (!PIECE_ARRAY[BK]);
let bishop_attacks =
get_bishop_attacks_fast(target_square, occupancy_without_black_king);
if (PIECE_ARRAY[WB] & bishop_attacks) != 0 {
continue;
}
if (PIECE_ARRAY[WQ] & bishop_attacks) != 0 {
continue;
}
let rook_attacks =
get_rook_attacks_fast(target_square, occupancy_without_black_king);
if (PIECE_ARRAY[WR] & rook_attacks) != 0 {
continue;
}
if (PIECE_ARRAY[WQ] & rook_attacks) != 0 {
continue;
}
move_list[move_count][MOVE_STARTING] = black_king_position;
move_list[move_count][MOVE_TARGET] = target_square;
move_list[move_count][MOVE_TAG] = TAG_NONE ;
move_list[move_count][MOVE_PIECE] = BK ;
move_count += 1;
}
}
if black_king_check_count == 0 {
if CASTLE_RIGHTS[BKS_CASTLE_RIGHTS] == true {
if black_king_position == E8 {
//king on e1
if (BKS_EMPTY_BITBOARD & combined_occupancies) == 0 {
//f1 and g1 empty
if (PIECE_ARRAY[BR] & constants::SQUARE_BBS[H8]) != 0 {
//rook on h1
if is_square_attacked_by_white(F8 , combined_occupancies)
== false
{
if is_square_attacked_by_white(G8 , combined_occupancies)
== false
{
move_list[move_count][MOVE_STARTING] = E8 ;
move_list[move_count][MOVE_TARGET] = G8 ;
move_list[move_count][MOVE_TAG] = TAG_BCASTLEKS ;
move_list[move_count][MOVE_PIECE] = BK ;
move_count += 1
}
}
}
}
}
}
if CASTLE_RIGHTS[BQS_CASTLE_RIGHTS] == true {
if black_king_position == E8 {
//king on e1
if (BQS_EMPTY_BITBOARD & combined_occupancies) == 0 {
//f1 and g1 empty
if (PIECE_ARRAY[BR] & constants::SQUARE_BBS[A8]) != 0 {
//rook on h1
if is_square_attacked_by_white(C8 , combined_occupancies)
== false
{
if is_square_attacked_by_white(D8 , combined_occupancies)
== false
{
move_list[move_count][MOVE_STARTING] = E8 ;
move_list[move_count][MOVE_TARGET] = C8 ;
move_list[move_count][MOVE_TAG] = TAG_BCASTLEQS ;
move_list[move_count][MOVE_PIECE] = BK ;
move_count += 1
}
}
}
}
}
}
}
}
if depth == 1 {
return move_count as u64;
}
let mut nodes: u64 = 0;
//let mut prior_nodes: u64;
let copy_ep: usize = EP;
let mut copy_castle: [bool; 4] = [true, true, true, true];
copy_castle[0] = CASTLE_RIGHTS[0];
copy_castle[1] = CASTLE_RIGHTS[1];
copy_castle[2] = CASTLE_RIGHTS[2];
copy_castle[3] = CASTLE_RIGHTS[3];
for move_index in 0..move_count {
let starting_square: usize = move_list[move_index][MOVE_STARTING] ;
let target_square: usize = move_list[move_index][MOVE_TARGET] ;
let piece: usize = move_list[move_index][MOVE_PIECE] ;
let tag: usize = move_list[move_index][MOVE_TAG] ;
let mut capture_index: usize = 0;
WHITE_TO_PLAY = !WHITE_TO_PLAY;
match tag {
TAG_NONE => {
//none
PIECE_ARRAY[piece] |= constants::SQUARE_BBS[target_square];
PIECE_ARRAY[piece] &= !constants::SQUARE_BBS[starting_square];
EP = NO_SQUARE ;
}
TAG_CAPTURE => {
//capture
PIECE_ARRAY[piece] |= constants::SQUARE_BBS[target_square ];
PIECE_ARRAY[piece] &= !constants::SQUARE_BBS[starting_square];
if piece <= WK {
for i in BP..BK + 1 {
if (PIECE_ARRAY[i] & constants::SQUARE_BBS[target_square ]) != 0
{
capture_index = i;
break;
}
}
PIECE_ARRAY[capture_index ] &=
!constants::SQUARE_BBS[target_square ]
} else {
//is black
for i in WP..BP {
if (PIECE_ARRAY[i] & constants::SQUARE_BBS[target_square]) != 0 {
capture_index = i;
break;
}
}
PIECE_ARRAY[capture_index] &= !constants::SQUARE_BBS[target_square];
}
EP = NO_SQUARE ;
}
TAG_WHITEEP => {
//white ep
//move piece
PIECE_ARRAY[WP] |= constants::SQUARE_BBS[target_square];
PIECE_ARRAY[WP] &= !constants::SQUARE_BBS[starting_square];
//remove
PIECE_ARRAY[BP] &= !constants::SQUARE_BBS[target_square + 8];
EP = NO_SQUARE ;
}
TAG_BLACKEP => {
//black ep
//move piece
PIECE_ARRAY[BP] |= constants::SQUARE_BBS[target_square];
PIECE_ARRAY[BP] &= !constants::SQUARE_BBS[starting_square];
//remove white pawn square up
PIECE_ARRAY[WP] &= !constants::SQUARE_BBS[target_square - 8];
EP = NO_SQUARE ;
}
TAG_WCASTLEKS => {
//WKS
//white king
PIECE_ARRAY[WK] |= constants::SQUARE_BBS[G1];
PIECE_ARRAY[WK] &= !constants::SQUARE_BBS[E1];
//white rook
PIECE_ARRAY[WR] |= constants::SQUARE_BBS[F1];
PIECE_ARRAY[WR] &= !constants::SQUARE_BBS[H1];
//occupancies
CASTLE_RIGHTS[WKS_CASTLE_RIGHTS] = false;
CASTLE_RIGHTS[WQS_CASTLE_RIGHTS] = false;
EP = NO_SQUARE ;
}
TAG_WCASTLEQS => {
//WQS
//white king
PIECE_ARRAY[WK] |= constants::SQUARE_BBS[C1];
PIECE_ARRAY[WK] &= !constants::SQUARE_BBS[E1];
//white rook
PIECE_ARRAY[WR] |= constants::SQUARE_BBS[D1];
PIECE_ARRAY[WR] &= !constants::SQUARE_BBS[A1];
CASTLE_RIGHTS[WKS_CASTLE_RIGHTS] = false;
CASTLE_RIGHTS[WQS_CASTLE_RIGHTS] = false;
EP = NO_SQUARE ;
}
TAG_BCASTLEKS => {
//BKS
//white king
PIECE_ARRAY[BK] |= constants::SQUARE_BBS[G8];
PIECE_ARRAY[BK] &= !constants::SQUARE_BBS[E8];
//white rook
PIECE_ARRAY[BR] |= constants::SQUARE_BBS[F8];
PIECE_ARRAY[BR] &= !constants::SQUARE_BBS[H8];
CASTLE_RIGHTS[BKS_CASTLE_RIGHTS] = false;
CASTLE_RIGHTS[BQS_CASTLE_RIGHTS] = false;
EP = NO_SQUARE ;
}
TAG_BCASTLEQS => {
//BQS
//white king
PIECE_ARRAY[BK] |= constants::SQUARE_BBS[C8];
PIECE_ARRAY[BK] &= !constants::SQUARE_BBS[E8];
//white rook
PIECE_ARRAY[BR] |= constants::SQUARE_BBS[D8];
PIECE_ARRAY[BR] &= !constants::SQUARE_BBS[A8];
CASTLE_RIGHTS[BKS_CASTLE_RIGHTS] = false;
CASTLE_RIGHTS[BQS_CASTLE_RIGHTS] = false;
EP = NO_SQUARE ;
}
TAG_B_KNIGHT_PROMOTION => {
//BNPr
PIECE_ARRAY[BN] |= constants::SQUARE_BBS[target_square];
PIECE_ARRAY[piece] &= !constants::SQUARE_BBS[starting_square];
EP = NO_SQUARE ;
}
TAG_B_BISHOP_PROMOTION => {
//BBPr
PIECE_ARRAY[BB] |= constants::SQUARE_BBS[target_square];
PIECE_ARRAY[piece] &= !constants::SQUARE_BBS[starting_square];
EP = NO_SQUARE ;
}
TAG_B_QUEEN_PROMOTION => {
//BQPr
PIECE_ARRAY[BQ] |= constants::SQUARE_BBS[target_square];
PIECE_ARRAY[piece] &= !constants::SQUARE_BBS[starting_square];
EP = NO_SQUARE ;
}
TAG_B_ROOK_PROMOTION => {
//BRPr
PIECE_ARRAY[BR] |= constants::SQUARE_BBS[target_square];
PIECE_ARRAY[piece] &= !constants::SQUARE_BBS[starting_square];
EP = NO_SQUARE ;
}
TAG_W_KNIGHT_PROMOTION => {
//WNPr
PIECE_ARRAY[WN] |= constants::SQUARE_BBS[target_square];
PIECE_ARRAY[piece] &= !constants::SQUARE_BBS[starting_square];
EP = NO_SQUARE ;
}
TAG_W_BISHOP_PROMOTION => {
//WBPr
PIECE_ARRAY[WB] |= constants::SQUARE_BBS[target_square];
PIECE_ARRAY[piece] &= !constants::SQUARE_BBS[starting_square];
EP = NO_SQUARE ;
}
TAG_W_QUEEN_PROMOTION => {
//WQPr
PIECE_ARRAY[WQ] |= constants::SQUARE_BBS[target_square];
PIECE_ARRAY[piece] &= !constants::SQUARE_BBS[starting_square];
EP = NO_SQUARE ;
}
TAG_W_ROOK_PROMOTION => {
//WRPr
PIECE_ARRAY[WR] |= constants::SQUARE_BBS[target_square ];
PIECE_ARRAY[piece] &= !constants::SQUARE_BBS[starting_square];
EP = NO_SQUARE ;
}
TAG_B_CAPTURE_KNIGHT_PROMOTION => {
//BNPrCAP
PIECE_ARRAY[BN] |= constants::SQUARE_BBS[target_square];
PIECE_ARRAY[piece] &= !constants::SQUARE_BBS[starting_square];
EP = NO_SQUARE ;
for i in WP..BP {
if (PIECE_ARRAY[i] & constants::SQUARE_BBS[target_square]) != 0 {
capture_index = i;
break;
}
}
PIECE_ARRAY[capture_index] &= !constants::SQUARE_BBS[target_square]
}
TAG_B_CAPTURE_BISHOP_PROMOTION => {
//BBPrCAP
PIECE_ARRAY[BB] |= constants::SQUARE_BBS[target_square];
PIECE_ARRAY[piece] &= !constants::SQUARE_BBS[starting_square];
EP = NO_SQUARE ;
for i in WP..BP {
if (PIECE_ARRAY[i] & constants::SQUARE_BBS[target_square]) != 0 {
capture_index = i;
break;
}
}
PIECE_ARRAY[capture_index] &= !constants::SQUARE_BBS[target_square];
}
TAG_B_CAPTURE_QUEEN_PROMOTION => {
//BQPrCAP
PIECE_ARRAY[BQ] |= constants::SQUARE_BBS[target_square];
PIECE_ARRAY[piece] &= !constants::SQUARE_BBS[starting_square];
EP = NO_SQUARE ;
for i in WP..BP {
if (PIECE_ARRAY[i] & constants::SQUARE_BBS[target_square]) != 0 {
capture_index = i;
break;
}
}
PIECE_ARRAY[capture_index] &= !constants::SQUARE_BBS[target_square];
}
TAG_B_CAPTURE_ROOK_PROMOTION => {
//BRPrCAP
PIECE_ARRAY[BR] |= constants::SQUARE_BBS[target_square];
PIECE_ARRAY[piece] &= !constants::SQUARE_BBS[starting_square];
EP = NO_SQUARE ;
for i in WP..BP {
if (PIECE_ARRAY[i] & constants::SQUARE_BBS[target_square]) != 0 {
capture_index = i;
break;
}
}
PIECE_ARRAY[capture_index] &= !constants::SQUARE_BBS[target_square];
}
TAG_W_CAPTURE_KNIGHT_PROMOTION => {
//WNPrCAP
PIECE_ARRAY[WN] |= constants::SQUARE_BBS[target_square];
PIECE_ARRAY[piece] &= !constants::SQUARE_BBS[starting_square];
EP = NO_SQUARE ;
for i in BP..BK + 1 {
if (PIECE_ARRAY[i] & constants::SQUARE_BBS[target_square]) != 0 {
capture_index = i;
break;
}
}
PIECE_ARRAY[capture_index] &= !constants::SQUARE_BBS[target_square]
}
TAG_W_CAPTURE_BISHOP_PROMOTION => {
//WBPrCAP
PIECE_ARRAY[WB] |= constants::SQUARE_BBS[target_square];
PIECE_ARRAY[piece] &= !constants::SQUARE_BBS[starting_square];
EP = NO_SQUARE ;
for i in BP..BK + 1 {
if (PIECE_ARRAY[i] & constants::SQUARE_BBS[target_square]) != 0 {
capture_index = i;
break;
}
}
PIECE_ARRAY[capture_index] &= !constants::SQUARE_BBS[target_square]
}
TAG_W_CAPTURE_QUEEN_PROMOTION => {
//WQPrCAP
PIECE_ARRAY[WQ] |= constants::SQUARE_BBS[target_square ];
PIECE_ARRAY[piece] &= !constants::SQUARE_BBS[starting_square];
EP = NO_SQUARE ;
for i in BP..BK + 1 {
if (PIECE_ARRAY[i] & constants::SQUARE_BBS[target_square ]) != 0 {
capture_index = i;
break;
}
}
PIECE_ARRAY[capture_index] &= !constants::SQUARE_BBS[target_square];
}
TAG_W_CAPTURE_ROOK_PROMOTION => {
//WRPrCAP
PIECE_ARRAY[WR] |= constants::SQUARE_BBS[target_square];
PIECE_ARRAY[piece] &= !constants::SQUARE_BBS[starting_square];
EP = NO_SQUARE ;
for i in BP..BK + 1 {
if (PIECE_ARRAY[i] & constants::SQUARE_BBS[target_square]) != 0 {
capture_index = i;
break;
}
}
PIECE_ARRAY[capture_index] &= !constants::SQUARE_BBS[target_square];
}
TAG_DOUBLE_PAWN_WHITE => {
//WDouble
PIECE_ARRAY[WP] |= constants::SQUARE_BBS[target_square];
PIECE_ARRAY[WP] &= !constants::SQUARE_BBS[starting_square];
EP = (target_square + 8) ;
}
TAG_DOUBLE_PAWN_BLACK => {
//BDouble
PIECE_ARRAY[BP] |= constants::SQUARE_BBS[target_square];
PIECE_ARRAY[BP] &= !constants::SQUARE_BBS[starting_square];
EP = (target_square - 8) ;
}
_ => {}
}
if piece == WK {
CASTLE_RIGHTS[WKS_CASTLE_RIGHTS] = false;
CASTLE_RIGHTS[WQS_CASTLE_RIGHTS] = false;
} else if piece == BK {
CASTLE_RIGHTS[BKS_CASTLE_RIGHTS] = false;
CASTLE_RIGHTS[BQS_CASTLE_RIGHTS] = false;
} else if piece == WR {
if CASTLE_RIGHTS[WKS_CASTLE_RIGHTS] == true {
if (PIECE_ARRAY[WR] & constants::SQUARE_BBS[H1]) == 0 {
CASTLE_RIGHTS[WKS_CASTLE_RIGHTS] = false;
}
}
if CASTLE_RIGHTS[WQS_CASTLE_RIGHTS] == true {
if (PIECE_ARRAY[WR] & constants::SQUARE_BBS[A1]) == 0 {
CASTLE_RIGHTS[WQS_CASTLE_RIGHTS] = false;
}
}
} else if piece == BR {
if CASTLE_RIGHTS[BKS_CASTLE_RIGHTS] == true {
if (PIECE_ARRAY[BR] & constants::SQUARE_BBS[H8]) == 0 {
CASTLE_RIGHTS[BKS_CASTLE_RIGHTS] = false;
}
}
if CASTLE_RIGHTS[BQS_CASTLE_RIGHTS] == true {
if (PIECE_ARRAY[BR] & constants::SQUARE_BBS[A8]) == 0 {
CASTLE_RIGHTS[BQS_CASTLE_RIGHTS] = false;
}
}
}
//prior_nodes = nodes;
nodes += perft_inline_go(depth - 1, ply + 1);
WHITE_TO_PLAY = !WHITE_TO_PLAY;
match tag {
TAG_NONE => {
//none
PIECE_ARRAY[piece] |= constants::SQUARE_BBS[starting_square];
PIECE_ARRAY[piece] &= !constants::SQUARE_BBS[target_square];
}
TAG_CAPTURE => {
//capture
PIECE_ARRAY[piece] |= constants::SQUARE_BBS[starting_square];
PIECE_ARRAY[piece] &= !constants::SQUARE_BBS[target_square];
if piece <= WK {
PIECE_ARRAY[capture_index] |= constants::SQUARE_BBS[target_square];
} else {
//is black
PIECE_ARRAY[capture_index] |= constants::SQUARE_BBS[target_square];
}
}
TAG_WHITEEP => {
//white ep
PIECE_ARRAY[WP] |= constants::SQUARE_BBS[starting_square];
PIECE_ARRAY[WP] &= !constants::SQUARE_BBS[target_square];
PIECE_ARRAY[BP] |= constants::SQUARE_BBS[target_square + 8];
}
TAG_BLACKEP => {
//black ep
PIECE_ARRAY[BP] |= constants::SQUARE_BBS[starting_square];
PIECE_ARRAY[BP] &= !constants::SQUARE_BBS[target_square];
PIECE_ARRAY[WP] |= constants::SQUARE_BBS[target_square - 8];
}
TAG_WCASTLEKS => {
//WKS
//white king
PIECE_ARRAY[WK] |= constants::SQUARE_BBS[E1];
PIECE_ARRAY[WK] &= !constants::SQUARE_BBS[G1];
//white rook
PIECE_ARRAY[WR] |= constants::SQUARE_BBS[H1];
PIECE_ARRAY[WR] &= !constants::SQUARE_BBS[F1];
}
TAG_WCASTLEQS => {
//WQS
//white king
PIECE_ARRAY[WK] |= constants::SQUARE_BBS[E1];
PIECE_ARRAY[WK] &= !constants::SQUARE_BBS[C1];
//white rook
PIECE_ARRAY[WR] |= constants::SQUARE_BBS[A1];
PIECE_ARRAY[WR] &= !constants::SQUARE_BBS[D1];
}
TAG_BCASTLEKS => {
//BKS
//white king
PIECE_ARRAY[BK] |= constants::SQUARE_BBS[E8];
PIECE_ARRAY[BK] &= !constants::SQUARE_BBS[G8];
//white rook
PIECE_ARRAY[BR] |= constants::SQUARE_BBS[H8];
PIECE_ARRAY[BR] &= !constants::SQUARE_BBS[F8];
}
TAG_BCASTLEQS => {
//BQS
//white king
PIECE_ARRAY[BK] |= constants::SQUARE_BBS[E8];
PIECE_ARRAY[BK] &= !constants::SQUARE_BBS[C8];
//white rook
PIECE_ARRAY[BR] |= constants::SQUARE_BBS[A8];
PIECE_ARRAY[BR] &= !constants::SQUARE_BBS[D8];
}
TAG_B_KNIGHT_PROMOTION => {
//BNPr
PIECE_ARRAY[BP] |= constants::SQUARE_BBS[starting_square];
PIECE_ARRAY[BN] &= !constants::SQUARE_BBS[target_square];
}
TAG_B_BISHOP_PROMOTION => {
//BBPr
PIECE_ARRAY[BP] |= constants::SQUARE_BBS[starting_square];
PIECE_ARRAY[BB] &= !constants::SQUARE_BBS[target_square];
}
TAG_B_QUEEN_PROMOTION => {
//BQPr
PIECE_ARRAY[BP] |= constants::SQUARE_BBS[starting_square];
PIECE_ARRAY[BQ] &= !constants::SQUARE_BBS[target_square];
}
TAG_B_ROOK_PROMOTION => {
//BRPr
PIECE_ARRAY[BP] |= constants::SQUARE_BBS[starting_square];
PIECE_ARRAY[BR] &= !constants::SQUARE_BBS[target_square];
}
TAG_W_KNIGHT_PROMOTION => {
//WNPr
PIECE_ARRAY[WP] |= constants::SQUARE_BBS[starting_square];
PIECE_ARRAY[WN] &= !constants::SQUARE_BBS[target_square];
}
TAG_W_BISHOP_PROMOTION => {
//WBPr
PIECE_ARRAY[WP] |= constants::SQUARE_BBS[starting_square];
PIECE_ARRAY[WB] &= !constants::SQUARE_BBS[target_square];
}
TAG_W_QUEEN_PROMOTION => {
//WQPr
PIECE_ARRAY[WP] |= constants::SQUARE_BBS[starting_square];
PIECE_ARRAY[WQ] &= !constants::SQUARE_BBS[target_square];
}
TAG_W_ROOK_PROMOTION => {
//WRPr
PIECE_ARRAY[WP] |= constants::SQUARE_BBS[starting_square];
PIECE_ARRAY[WR] &= !constants::SQUARE_BBS[target_square];
}
TAG_B_CAPTURE_KNIGHT_PROMOTION => {
//BNPrCAP
PIECE_ARRAY[BP] |= constants::SQUARE_BBS[starting_square];
PIECE_ARRAY[BN] &= !constants::SQUARE_BBS[target_square];
PIECE_ARRAY[capture_index] |= constants::SQUARE_BBS[target_square];
}
TAG_B_CAPTURE_BISHOP_PROMOTION => {
//BBPrCAP
PIECE_ARRAY[BP] |= constants::SQUARE_BBS[starting_square];
PIECE_ARRAY[BB] &= !constants::SQUARE_BBS[target_square];
PIECE_ARRAY[capture_index] |= constants::SQUARE_BBS[target_square];
}
TAG_B_CAPTURE_QUEEN_PROMOTION => {
//BQPrCAP
PIECE_ARRAY[BP] |= constants::SQUARE_BBS[starting_square];
PIECE_ARRAY[BQ] &= !constants::SQUARE_BBS[target_square];
PIECE_ARRAY[capture_index] |= constants::SQUARE_BBS[target_square];
}
TAG_B_CAPTURE_ROOK_PROMOTION => {
//BRPrCAP
PIECE_ARRAY[BP] |= constants::SQUARE_BBS[starting_square];
PIECE_ARRAY[BR] &= !constants::SQUARE_BBS[target_square];
PIECE_ARRAY[capture_index] |= constants::SQUARE_BBS[target_square];
}
TAG_W_CAPTURE_KNIGHT_PROMOTION => {
//WNPrCAP
PIECE_ARRAY[WP] |= constants::SQUARE_BBS[starting_square];
PIECE_ARRAY[WN] &= !constants::SQUARE_BBS[target_square ];
PIECE_ARRAY[capture_index] |= constants::SQUARE_BBS[target_square ];
}
TAG_W_CAPTURE_BISHOP_PROMOTION => {
//WBPrCAP
PIECE_ARRAY[WP] |= constants::SQUARE_BBS[starting_square];
PIECE_ARRAY[WB] &= !constants::SQUARE_BBS[target_square];
PIECE_ARRAY[capture_index] |= constants::SQUARE_BBS[target_square];
}
TAG_W_CAPTURE_QUEEN_PROMOTION => {
//WQPrCAP
PIECE_ARRAY[WP] |= constants::SQUARE_BBS[starting_square];
PIECE_ARRAY[WQ] &= !constants::SQUARE_BBS[target_square];
PIECE_ARRAY[capture_index] |= constants::SQUARE_BBS[target_square];
}
TAG_W_CAPTURE_ROOK_PROMOTION => {
//WRPrCAP
PIECE_ARRAY[WP] |= constants::SQUARE_BBS[starting_square];
PIECE_ARRAY[WR] &= !constants::SQUARE_BBS[target_square];
PIECE_ARRAY[capture_index] |= constants::SQUARE_BBS[target_square];
}
TAG_DOUBLE_PAWN_WHITE => {
//WDouble
PIECE_ARRAY[WP] |= constants::SQUARE_BBS[starting_square];
PIECE_ARRAY[WP] &= !constants::SQUARE_BBS[target_square];
}
TAG_DOUBLE_PAWN_BLACK => {
//BDouble
PIECE_ARRAY[BP] |= constants::SQUARE_BBS[starting_square];
PIECE_ARRAY[BP] &= !constants::SQUARE_BBS[target_square];
}
_ => {}
}
CASTLE_RIGHTS[0] = copy_castle[0];
CASTLE_RIGHTS[1] = copy_castle[1];
CASTLE_RIGHTS[2] = copy_castle[2];
CASTLE_RIGHTS[3] = copy_castle[3];
EP = copy_ep;
//if ply == 0 {
// print_move_no_nl(startingSquare, targetSquare, piece);
// println!(": {}", nodes - priorNodes);
//}
}
return nodes;
}
}
fn run_perft_inline(depth: i32) {
let timestamp_start = Instant::now();
let nodes = perft_inline_go(depth, 0);
let elapsed = timestamp_start.elapsed();
println!("Nodes: {}", nodes);
println!("Elapsed time: {:?}", elapsed);
}
fn main() {
set_starting_position();
print_board();
//run_perft_inline(6);
run_perft_inline_struct(6);
}
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