OMGeeky/hcsalmon1-Chess-Engine-Test
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hcsalmon1-Chess-Engine-Test/Rust/main.rs
Coding with Tom 2b0847b6bb Update main.rs 
Made movelist and pin arrays global. reduced movelist to 50 for each part.
2025-01-22 13:50:01 +00:00

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use std::time::Instant;
mod constants;
const NO_SQUARE:usize = 64;
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;
const MAGIC:u64 = 0x03f79d71b4cb0a89;
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];
}
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 PINNED_SQUARE_INDEX:usize = 0;
const PINNING_PIECE_INDEX:usize = 1;
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 MOVE_STARTING: usize = 0;
const MOVE_TARGET: usize = 1;
const MOVE_PIECE: usize = 2;
const MOVE_TAG: usize = 3;
const MAX_ULONG: u64 = 18446744073709551615;
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 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 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 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;
fn Is_Square_Attacked_By_Black_Global(square:usize, occupancy: u64) -> bool {
unsafe{
if ((PIECE_ARRAY[BP] & constants::WHITE_PAWN_ATTACKS[square]) != 0) {
return true;
}
if ((PIECE_ARRAY[BN] & constants::KNIGHT_ATTACKS[square]) != 0) {
return true;
}
if ((PIECE_ARRAY[BK] & constants::KING_ATTACKS[square]) != 0) {
return true;
}
let bishopAttacks = get_bishop_attacks_fast(square, occupancy);
if ((PIECE_ARRAY[BB] & bishopAttacks) != 0) {
return true;
}
if ((PIECE_ARRAY[BQ] & bishopAttacks) != 0) {
return true;
}
let rookAttacks = get_rook_attacks_fast(square, occupancy);
if ((PIECE_ARRAY[BR] & rookAttacks) != 0) {
return true;
}
if ((PIECE_ARRAY[BQ] & rookAttacks) != 0) {
return true;
}
return false;
}
}
fn Is_Square_Attacked_By_White_Global(square:usize, occupancy:u64) -> bool {
unsafe{
if ((PIECE_ARRAY[WP] & constants::BLACK_PAWN_ATTACKS[square]) != 0) {
return true;
}
if ((PIECE_ARRAY[WN] & constants::KNIGHT_ATTACKS[square]) != 0) {
return true;
}
if ((PIECE_ARRAY[WK] & constants::KING_ATTACKS[square]) != 0) {
return true;
}
let bishopAttacks = get_bishop_attacks_fast(square, occupancy);
if ((PIECE_ARRAY[WB] & bishopAttacks) != 0) {
return true;
}
if ((PIECE_ARRAY[WQ] & bishopAttacks) != 0) {
return true;
}
let rookAttacks = get_rook_attacks_fast(square, occupancy);
if ((PIECE_ARRAY[WR] & rookAttacks) != 0) {
return true;
}
if ((PIECE_ARRAY[WQ] & rookAttacks) != 0) {
return true;
}
return false;
}
}
fn OutOfBounds(input:usize) -> bool {
if input > 63 {
return true;
}
return false;
}
fn PrMoveNoNL(starting_square:usize, target_square:usize) { //starting
if (OutOfBounds(starting_square) == true) {
print!("{}", starting_square);
} else {
print!("{}{}", SQ_CHAR_X[starting_square], SQ_CHAR_Y[starting_square]);
}
if (OutOfBounds(target_square) == true) {
print!("{}", target_square);
} else {
print!("{}{}", 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 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!();
println!();
}
}
static mut STARTING_SQUARES: [[usize; 50]; 6] = [[0; 50]; 6];
static mut TARGET_SQUARES: [[usize; 50]; 6] = [[0; 50]; 6];
static mut TAGS: [[usize; 50]; 6] = [[0; 50]; 6];
static mut PIECES: [[usize; 50]; 6] = [[0; 50]; 6];
static mut PIN_ARRAY_SQUARES: [usize; 8] = [NO_SQUARE; 8];
static mut PIN_ARRAY_PIECES: [usize; 8] = [NO_SQUARE; 8];
fn perft_inline(depth:i8, ply:usize) -> usize {
unsafe {
//if (depth == 0)
//{
// return 1;
//}
let mut move_count: usize = 0;
//Move generating variables
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 = 0;
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 = NO_SQUARE;
let mut pin_number: usize = 0;
if WHITE_TO_PLAY == true
{
let mut white_king_check_count: usize = 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);
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);
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 {
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_SQUARES[pin_number] = pinned_square;
PIN_ARRAY_PIECES[pin_number] = 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 {
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_SQUARES[pin_number] = pinned_square;
PIN_ARRAY_PIECES[pin_number] = 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 {
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_SQUARES[pin_number] = pinned_square;
PIN_ARRAY_PIECES[pin_number] = 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 {
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_SQUARES[pin_number] = pinned_square;
PIN_ARRAY_PIECES[pin_number] = piece_square;
pin_number+=1;
}
}
temp_bitboard &= temp_bitboard - 1;
}
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;
}
STARTING_SQUARES[ply][move_count] = white_king_position;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_NONE;
PIECES[ply][move_count] = 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;
}
STARTING_SQUARES[ply][move_count] = white_king_position;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_CAPTURE;
PIECES[ply][move_count] = 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;
}
STARTING_SQUARES[ply][move_count] = white_king_position;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_NONE;
PIECES[ply][move_count] = 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;
}
STARTING_SQUARES[ply][move_count] = white_king_position;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_CAPTURE;
PIECES[ply][move_count] = 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_Global(F1, combined_occupancies) == false)
{
if (Is_Square_Attacked_By_Black_Global(G1, combined_occupancies) == false)
{
STARTING_SQUARES[ply][move_count] = E1;
TARGET_SQUARES[ply][move_count] = G1;
TAGS[ply][move_count] = TAG_WCASTLEKS;
PIECES[ply][move_count] = 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_Global(C1, combined_occupancies) == false)
{
if (Is_Square_Attacked_By_Black_Global(D1, combined_occupancies) == false)
{
STARTING_SQUARES[ply][move_count] = E1;
TARGET_SQUARES[ply][move_count] = C1;
TAGS[ply][move_count] = TAG_WCASTLEQS;
PIECES[ply][move_count] = 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_SQUARES[i] == starting_square)
{
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS[white_king_position][PIN_ARRAY_PIECES[i]];
}
}
}
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;
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_CAPTURE;
PIECES[ply][move_count] = 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;
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_NONE;
PIECES[ply][move_count] = 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_SQUARES[i] == starting_square) {
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS[white_king_position][PIN_ARRAY_PIECES[i]];
}
}
}
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
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = starting_square - 8;
TAGS[ply][move_count] = TAG_W_QUEEN_PROMOTION;
PIECES[ply][move_count] = WP;
move_count+=1;
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = starting_square - 8;
TAGS[ply][move_count] = TAG_W_ROOK_PROMOTION;
PIECES[ply][move_count] = WP;
move_count+=1;
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = starting_square - 8;
TAGS[ply][move_count] = TAG_W_BISHOP_PROMOTION;
PIECES[ply][move_count] = WP;
move_count+=1;
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = starting_square - 8;
TAGS[ply][move_count] = TAG_W_KNIGHT_PROMOTION;
PIECES[ply][move_count] = WP;
move_count+=1;
} else {
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = starting_square - 8;
TAGS[ply][move_count] = TAG_NONE;
PIECES[ply][move_count] = 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
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = starting_square - 16;
TAGS[ply][move_count] = TAG_DOUBLE_PAWN_WHITE;
PIECES[ply][move_count] = 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
{
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_W_CAPTURE_BISHOP_PROMOTION;
PIECES[ply][move_count] = WP;
move_count+=1;
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_W_CAPTURE_KNIGHT_PROMOTION;
PIECES[ply][move_count] = WP;
move_count+=1;
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_W_CAPTURE_QUEEN_PROMOTION;
PIECES[ply][move_count] = WP;
move_count+=1;
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_W_CAPTURE_ROOK_PROMOTION;
PIECES[ply][move_count] = WP;
move_count+=1;
}
else
{
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_CAPTURE;
PIECES[ply][move_count] = 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
{
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = EP;
TAGS[ply][move_count] = TAG_WHITEEP;
PIECES[ply][move_count] = 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
{
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = EP;
TAGS[ply][move_count] = TAG_WHITEEP;
PIECES[ply][move_count] = 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)
{
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = EP;
TAGS[ply][move_count] = TAG_WHITEEP;
PIECES[ply][move_count] = WP;
move_count+=1;
}
}
}
}
}
}
}
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_SQUARES[i] == starting_square)
{
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS[white_king_position][PIN_ARRAY_PIECES[i]];
}
}
}
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;
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_CAPTURE;
PIECES[ply][move_count] = 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;
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_NONE;
PIECES[ply][move_count] = WR;
move_count+=1;
}
}
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_SQUARES[i] == starting_square) {
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS[white_king_position][PIN_ARRAY_PIECES[i]];
}
}
}
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;
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_CAPTURE;
PIECES[ply][move_count] = 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;
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_NONE;
PIECES[ply][move_count] = 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_SQUARES[i] == starting_square) {
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS[white_king_position][PIN_ARRAY_PIECES[i]];
}
}
}
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;
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_CAPTURE;
PIECES[ply][move_count] = 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;
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_NONE;
PIECES[ply][move_count] = 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);
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_SQUARES[pin_number] = pinned_square;
PIN_ARRAY_PIECES[pin_number] = 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_SQUARES[pin_number] = pinned_square;
PIN_ARRAY_PIECES[pin_number] = 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_SQUARES[pin_number] = pinned_square;
PIN_ARRAY_PIECES[pin_number] = 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_SQUARES[pin_number] = pinned_square;
PIN_ARRAY_PIECES[pin_number] = 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;
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;
}
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_CAPTURE;
PIECES[ply][move_count] = 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;
}
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_NONE;
PIECES[ply][move_count] = 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_SQUARES[i] == starting_square) {
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS[black_king_position][PIN_ARRAY_PIECES[i]];
}
}
}
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
{
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = starting_square + 8;
TAGS[ply][move_count] = TAG_B_BISHOP_PROMOTION;
PIECES[ply][move_count] = BP;
move_count+=1;
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = starting_square + 8;
TAGS[ply][move_count] = TAG_B_KNIGHT_PROMOTION;
PIECES[ply][move_count] = BP;
move_count+=1;
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = starting_square + 8;
TAGS[ply][move_count] = TAG_B_ROOK_PROMOTION;
PIECES[ply][move_count] = BP;
move_count+=1;
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = starting_square + 8;
TAGS[ply][move_count] = TAG_B_QUEEN_PROMOTION;
PIECES[ply][move_count] = BP;
move_count+=1;
}
else
{
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = starting_square + 8;
TAGS[ply][move_count] = TAG_NONE;
PIECES[ply][move_count] = 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
{
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = starting_square + 16;
TAGS[ply][move_count] = TAG_DOUBLE_PAWN_BLACK;
PIECES[ply][move_count] = 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
{
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_B_CAPTURE_BISHOP_PROMOTION;
PIECES[ply][move_count] = BP;
move_count+=1;
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_B_CAPTURE_ROOK_PROMOTION;
PIECES[ply][move_count] = BP;
move_count+=1;
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_B_CAPTURE_QUEEN_PROMOTION;
PIECES[ply][move_count] = BP;
move_count+=1;
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_B_CAPTURE_KNIGHT_PROMOTION;
PIECES[ply][move_count] = BP;
move_count+=1;
}
else
{
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_CAPTURE;
PIECES[ply][move_count] = 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
{
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = EP;
TAGS[ply][move_count] = TAG_BLACKEP;
PIECES[ply][move_count] = 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
{
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = EP;
TAGS[ply][move_count] = TAG_BLACKEP;
PIECES[ply][move_count] = 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)
{
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = EP;
TAGS[ply][move_count] = TAG_BLACKEP;
PIECES[ply][move_count] = 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_SQUARES[i] == starting_square) {
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS[black_king_position][PIN_ARRAY_PIECES[i]];
}
}
}
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;
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_CAPTURE;
PIECES[ply][move_count] = 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;
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_NONE;
PIECES[ply][move_count] = 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_SQUARES[i] == starting_square) {
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS[black_king_position][PIN_ARRAY_PIECES[i]];
}
}
}
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;
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_CAPTURE;
PIECES[ply][move_count] = 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;
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_NONE;
PIECES[ply][move_count] = 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_SQUARES[i] == starting_square)
{
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS[black_king_position][PIN_ARRAY_PIECES[i]];
}
}
}
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;
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_CAPTURE;
PIECES[ply][move_count] = 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;
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_NONE;
PIECES[ply][move_count] = 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_SQUARES[i] == starting_square) {
temp_pin_bitboard = constants::INBETWEEN_BITBOARDS[black_king_position][PIN_ARRAY_PIECES[i]];
}
}
}
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;
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_CAPTURE;
PIECES[ply][move_count] = 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;
STARTING_SQUARES[ply][move_count] = starting_square;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_NONE;
PIECES[ply][move_count] = 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;
}
STARTING_SQUARES[ply][move_count] = black_king_position;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_CAPTURE;
PIECES[ply][move_count] = BK;
move_count+=1;
}
temp_attack = constants::KING_ATTACKS[black_king_position] & EMPTY_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;
}
STARTING_SQUARES[ply][move_count] = black_king_position;
TARGET_SQUARES[ply][move_count] = target_square;
TAGS[ply][move_count] = TAG_NONE;
PIECES[ply][move_count] = 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_Global(F8, combined_occupancies) == false)
{
if (Is_Square_Attacked_By_White_Global(G8, combined_occupancies) == false)
{
STARTING_SQUARES[ply][move_count] = E8;
TARGET_SQUARES[ply][move_count] = G8;
TAGS[ply][move_count] = TAG_BCASTLEKS;
PIECES[ply][move_count] = 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_Global(C8, combined_occupancies) == false)
{
if (Is_Square_Attacked_By_White_Global(D8, combined_occupancies) == false)
{
STARTING_SQUARES[ply][move_count] = E8;
TARGET_SQUARES[ply][move_count] = C8;
TAGS[ply][move_count] = TAG_BCASTLEQS;
PIECES[ply][move_count] = BK;
move_count+=1;
}
}
}
}
}
}
}
}
if (depth == 1)
{
return move_count;
}
let mut nodes: usize = 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 = STARTING_SQUARES[ply][move_index];
let target_square: usize = TARGET_SQUARES[ply][move_index];
let piece: usize = PIECES[ply][move_index];
let tag: usize = TAGS[ply][move_index];
let mut capture_index: usize = 0;
if (WHITE_TO_PLAY == true) {
WHITE_TO_PLAY = false;
} else {
WHITE_TO_PLAY = true;
}
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;
}
}
}
nodes += perft_inline(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 (epGlobal != NO_SQUARE)
//{
// std::cout << " ep: " << SQ_CHAR_X[epGlobal] << SQ_CHAR_Y[epGlobal] << '\n';
//}
//if (ply == 0)
//{
//PrMoveNoNL(startingSquare, targetSquare);
//print!(": {}\n", .{nodes - priorNodes});
//}
}
return nodes
}
}
fn run_perft(depth:i8) {
let timestamp_start = Instant::now();
let nodes = perft_inline(depth, 0);
let elapsed = timestamp_start.elapsed();
println!("Nodes: {}", nodes);
println!("Elapsed time: {:?}", elapsed);
}
fn main() {
set_starting_position();
print_board();
run_perft(6);
}
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