jirayu_sri/stockfish
1
0
Fork 0
mirror of https://github.com/official-stockfish/Stockfish.git synced 2026-07-22 20:57:10 +00:00
Code Issues Packages Projects Releases Wiki Activity

Remove pawn_attacks_bb()

Browse Source 
Generalize attacks_bb() to handle pawns and remove pawn_attacks_bb()

https://tests.stockfishchess.org/tests/view/67e9496231d7cf8afdc44a2e
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 134688 W: 34660 L: 34553 D: 65475
Ptnml(0-2): 298, 14619, 37462, 14608, 357

closes https://github.com/official-stockfish/Stockfish/pull/5947

No functional change
This commit is contained in:
mstembera
2025-04-02 17:39:40 +02:00
committed by Disservin
parent d2cb927a04
commit 1a395f1b56
4 changed files with 15 additions and 22 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/position.cpp
+9 -9
View File
@@ -270,7 +270,7 @@ Position& Position::set(const string& fenStr, bool isChess960, StateInfo* si) {
// a) side to move have a pawn threatening epSquare
// b) there is an enemy pawn in front of epSquare
// c) there is no piece on epSquare or behind epSquare
enpassant = pawn_attacks_bb(~sideToMove, st->epSquare) & pieces(sideToMove, PAWN)
enpassant = attacks_bb<PAWN>(st->epSquare, ~sideToMove) & pieces(sideToMove, PAWN)
&& (pieces(~sideToMove, PAWN) & (st->epSquare + pawn_push(~sideToMove)))
&& !(pieces() & (st->epSquare | (st->epSquare + pawn_push(sideToMove))));
}
@@ -321,7 +321,7 @@ void Position::set_check_info() const {
Square ksq = square<KING>(~sideToMove);
st->checkSquares[PAWN] = pawn_attacks_bb(~sideToMove, ksq);
st->checkSquares[PAWN] = attacks_bb<PAWN>(ksq, ~sideToMove);
st->checkSquares[KNIGHT] = attacks_bb<KNIGHT>(ksq);
st->checkSquares[BISHOP] = attacks_bb<BISHOP>(ksq, pieces());
st->checkSquares[ROOK] = attacks_bb<ROOK>(ksq, pieces());
@@ -487,8 +487,8 @@ Bitboard Position::attackers_to(Square s, Bitboard occupied) const {
return (attacks_bb<ROOK>(s, occupied) & pieces(ROOK, QUEEN))
| (attacks_bb<BISHOP>(s, occupied) & pieces(BISHOP, QUEEN))
| (pawn_attacks_bb(BLACK, s) & pieces(WHITE, PAWN))
| (pawn_attacks_bb(WHITE, s) & pieces(BLACK, PAWN))
| (attacks_bb<PAWN>(s, BLACK) & pieces(WHITE, PAWN))
| (attacks_bb<PAWN>(s, WHITE) & pieces(BLACK, PAWN))
| (attacks_bb<KNIGHT>(s) & pieces(KNIGHT)) | (attacks_bb<KING>(s) & pieces(KING));
}
@@ -498,7 +498,7 @@ bool Position::attackers_to_exist(Square s, Bitboard occupied, Color c) const {
&& (attacks_bb<ROOK>(s, occupied) & pieces(c, ROOK, QUEEN)))
|| ((attacks_bb<BISHOP>(s) & pieces(c, BISHOP, QUEEN))
&& (attacks_bb<BISHOP>(s, occupied) & pieces(c, BISHOP, QUEEN)))
|| (((pawn_attacks_bb(~c, s) & pieces(PAWN)) | (attacks_bb<KNIGHT>(s) & pieces(KNIGHT))
|| (((attacks_bb<PAWN>(s, ~c) & pieces(PAWN)) | (attacks_bb<KNIGHT>(s) & pieces(KNIGHT))
| (attacks_bb<KING>(s) & pieces(KING)))
& pieces(c));
}
@@ -597,9 +597,9 @@ bool Position::pseudo_legal(const Move m) const {
if ((Rank8BB | Rank1BB) & to)
return false;
if (!(pawn_attacks_bb(us, from) & pieces(~us) & to) // Not a capture
&& !((from + pawn_push(us) == to) && empty(to)) // Not a single push
&& !((from + 2 * pawn_push(us) == to) // Not a double push
if (!(attacks_bb<PAWN>(from, us) & pieces(~us) & to) // Not a capture
&& !((from + pawn_push(us) == to) && empty(to)) // Not a single push
&& !((from + 2 * pawn_push(us) == to) // Not a double push
&& (relative_rank(us, from) == RANK_2) && empty(to) && empty(to - pawn_push(us))))
return false;
}
@@ -812,7 +812,7 @@ DirtyPiece Position::do_move(Move m,
{
// Set en passant square if the moved pawn can be captured
if ((int(to) ^ int(from)) == 16
&& (pawn_attacks_bb(us, to - pawn_push(us)) & pieces(them, PAWN)))
&& (attacks_bb<PAWN>(to - pawn_push(us), us) & pieces(them, PAWN)))
{
st->epSquare = to - pawn_push(us);
k ^= Zobrist::enpassant[file_of(st->epSquare)];