Captures are tactical moves changing material balance where an opponent piece is removed from the board as part of the completion of the move. This is either done by moving a piece to a square, which is occupied by the opponent captured piece - or as a special case of pawn takes pawn, en passant.
Winning captures are those with least valuable aggressor of most valuable victim, where even a recapture would win material, and captures of pieces en prise, that is the union of undefended (hanging) pieces, as well as pieces defended inadequately. A static exchange evaluation might be applied to determine a victim is en prise or not. Equal captures are exchanges of equal valued pieces. Winning, as well as equal captures are subject of quiescence search. Some programs extend captures or recaptures under certain conditions, i.e. material becomes close to the root score again.
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Captures are tactical moves changing material balance where an opponent piece is removed from the board as part of the completion of the move. This is either done by moving a piece to a square, which is occupied by the opponent captured piece - or as a special case of pawn takes pawn, en passant.
Winning captures are those with least valuable aggressor of most valuable victim, where even a recapture would win material, and captures of pieces en prise, that is the union of undefended (hanging) pieces, as well as pieces defended inadequately. A static exchange evaluation might be applied to determine a victim is en prise or not. Equal captures are exchanges of equal valued pieces. Winning, as well as equal captures are subject of quiescence search. Some programs extend captures or recaptures under certain conditions, i.e. material becomes close to the root score again.
Capture Generation
With mailbox like square centric board representations, capture generation requires a so called blocker loop, while bitboards rely on attack generation and intersection with the set of opponent pieces.Six times Take Five
See also
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