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implemented the generation of LUT: KING_ATTACK_MAPS

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Varga Dávid Lajos
2025-11-11 10:25:23 +01:00
parent c2fe2e968a
commit 4eb4bc1348
1 changed files with 10 additions and 1 deletions
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11
engine/src/bitboard/attackmaps.rs
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@@ -14,7 +14,16 @@ const GH_FILE: u64 = 0xC0C0_C0C0_C0C0_C0C0;
// KING_ATTACK_MAP[<square_index>]
pub static KING_ATTACK_MAP: Lazy<[u64; 64]> = Lazy::new(|| {
let table: [u64; 64] = [0u64; 64];
let mut table: [u64; 64] = [0u64; 64];
for sq in 0..64 {
let king: u64 = 1 << sq;
let left_attacks: u64 = king << 7 | king >> 1 | king >> 9;
let right_attacks: u64 = king << 1 | king << 9 | king >> 7;
table[sq] = (left_attacks & !H_FILE) | (right_attacks & !A_FILE) | king << 8 | king >> 8;
}
return table;
});