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The en passant capture is the only capturing move in chess where the capturing piece moves to a square not occupied by the captured piece. [6]: 463 Because many casual players are unfamiliar with or misunderstand the en passant rule, administrators on internet chess sites frequently receive erroneous complaints of bugs, cheating or hacking. [7]
A pawn, unlike other pieces, captures differently from how it moves. A pawn can capture an enemy piece on either of the two squares diagonally in front of the pawn. It cannot move to those squares when vacant except when capturing en passant. The pawn is also involved in the two special moves en passant and promotion. [10]
This glossary of chess explains commonly used terms in chess, in alphabetical order.Some of these terms have their own pages, like fork and pin.For a list of unorthodox chess pieces, see Fairy chess piece; for a list of terms specific to chess problems, see Glossary of chess problems; for a list of named opening lines, see List of chess openings; for a list of chess-related games, see List of ...
Examples of special pawn moves: (left) promotion; (right) en passant. Pawns have two special moves: En passant: when a pawn makes a two-square advance to the same rank as an opponent's pawn on an adjacent file, that pawn can capture it en passant ("in passing"), moving to one square behind the captured pawn. A pawn can only be captured en ...
The option to capture the moved pawn en passant must be exercised on the move immediately following the double-step pawn advance, or it is lost for the remainder of the game. The en passant capture is the only capture in chess in which the capturing piece does not replace the captured piece on the same square. [2]
When the moving piece moves to a square from which it threatens to inflict checkmate on the next move, the tactic is called a discovered attack with mate threat. A discovered checkmate itself is also possible. Less often, a move may discover multiple attacks, as in the first diagram where the knight's departure opens two crisscrossing diagonals.
Two positions are by definition "the same" if the same types of pieces occupy the same squares, the same player has the move, the remaining castling rights are the same and the possibility to capture en passant is the same. The repeated positions need not occur in succession.
For example, in a directmate, set play consists of lines of play starting with a Black move (rather than a White move). When set play exists, the key move may be something that does not change the set play lines, in which case the problem is a complete block, or the lines in the set play may change, in which case the problem is a mutate.