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Pinned aware SEE

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Don't allow pinned pieces to attack the exchange-square as long all
pinners (this includes also potential ones) are on their original
square.
As soon a pinner moves to the exchange-square or get captured on it, we
fall back to standard SEE behaviour.

This correctly handles the majority of cases with absolute pins.

bench: 6883133
This commit is contained in:
Guenther Demetz
2016-09-12 08:47:19 +02:00
committed by Marco Costalba
parent 4c95edddbf
commit 90ce24b11e
3 changed files with 36 additions and 16 deletions
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3
src/position.h
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@@ -64,6 +64,7 @@ struct StateInfo {
Piece capturedPiece;
StateInfo* previous;
Bitboard blockersForKing[COLOR_NB];
Bitboard pinnersForKing[COLOR_NB];
Bitboard checkSquares[PIECE_TYPE_NB];
};
@@ -121,7 +122,7 @@ public:
Bitboard attacks_from(Piece pc, Square s) const;
template<PieceType> Bitboard attacks_from(Square s) const;
template<PieceType> Bitboard attacks_from(Square s, Color c) const;
Bitboard slider_blockers(Bitboard sliders, Square s) const;
Bitboard slider_blockers(Bitboard sliders, Square s, Bitboard& pinners) const;
// Properties of moves
bool legal(Move m) const;