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Simplify attackers_to_exist function

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test based on #6586 by maximmasiutin

https://tests.stockfishchess.org/tests/view/69977d58e2562aa5bc1e09c4
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 225056 W: 58208 L: 58195 D: 108653
Ptnml(0-2): 677, 25001, 61196, 24940, 714

closes https://github.com/official-stockfish/Stockfish/pull/6633

No functional change
This commit is contained in:
maximmasiutin
2026-02-28 12:10:50 +01:00
committed by Joost VandeVondele
parent 4c0878cb0b
commit 702d4b8c9d
1 changed files with 4 additions and 7 deletions
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src/position.cpp
+4 -7
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@@ -513,13 +513,10 @@ Bitboard Position::attackers_to(Square s, Bitboard occupied) const {
bool Position::attackers_to_exist(Square s, Bitboard occupied, Color c) const { bool Position::attackers_to_exist(Square s, Bitboard occupied, Color c) const {
return ((attacks_bb<ROOK>(s) & pieces(c, ROOK, QUEEN)) return (attacks_bb<ROOK>(s, occupied) & pieces(c, ROOK, QUEEN))
&& (attacks_bb<ROOK>(s, occupied) & pieces(c, ROOK, QUEEN))) || (attacks_bb<BISHOP>(s, occupied) & pieces(c, BISHOP, QUEEN))
|| ((attacks_bb<BISHOP>(s) & pieces(c, BISHOP, QUEEN)) || (attacks_bb<PAWN>(s, ~c) & pieces(c, PAWN))
&& (attacks_bb<BISHOP>(s, occupied) & pieces(c, BISHOP, QUEEN))) || (attacks_bb<KNIGHT>(s) & pieces(c, KNIGHT)) || (attacks_bb<KING>(s) & pieces(c, KING));
|| (((attacks_bb<PAWN>(s, ~c) & pieces(PAWN)) | (attacks_bb<KNIGHT>(s) & pieces(KNIGHT))
| (attacks_bb<KING>(s) & pieces(KING)))
& pieces(c));
} }
// Tests whether a pseudo-legal move is legal // Tests whether a pseudo-legal move is legal