Home * Chess * Moves * Captures

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

capture
best case
worst case
capturing with the pawn
pxQ
winning queen
pawn for queen
pxR
winning rook
pawn for rook
pxB
winning bishop
pawn for bishop
pxN
winning knight
pawn for knight
pxP
winning pawn
exchanging pawns
capturing with the knight
nxQ
winning queen
knight for queen
nxR
winning rook
winning the exchange
nxB
winning bishop
exchanging minors
nxN
winning knight
exchanging minors
nxP
winning pawn
losing knight for pawn
capturing with the bishop
bxQ
winning queen
bishop for queen
bxR
winning rook
winning the exchange
bxB
winning bishop
exchanging minors
bxN
winning knight
exchanging minors
bxP
winning pawn
losing bishop for pawn
capturing with the rook
rxQ
winning queen
rook for queen
rxR
winning rook
exchanging rooks
rxB
winning bishop
losing exchange
rxN
winning knight
losing exchange
rxP
winning pawn
losing rook for pawn
capturing with the queen
qxQ
winning queen
exchanging queens
qxR
winning rook
losing queen for rook
qxB
winning bishop
losing queen for bishop
qxN
winning knight
losing queen for knight
qxP
winning pawn
losing queen for pawn
capturing with the king, always winning captures
kxQ
winning queen

kxR
winning rook

kxB
winning bishop

kxN
winning knight

kxP
winning pawn


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