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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]
An updated version of the spec has since made it so the target square is recorded only if a legal en passant capture is possible, but the old version of the standard is the one most commonly used. [7] [8] Halfmove clock: The number of halfmoves since the last capture or pawn advance, used for the fifty-move rule. [9]
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]
A move by a pawn or piece that removes from the board the opponent's pawn or piece. The capturing piece then occupies the square of the captured piece, except in the case of a capture that is done en passant. [66] castling A move in which the king and a rook are moved at the same time.
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 ...
Less often, a move may discover multiple attacks, as in the first diagram where the knight's departure opens two crisscrossing diagonals. And in exceptional circumstances, it is even possible for two checks to be revealed simultaneously. The only way for this to happen in orthodox chess is by way of an en passant capture. In the position shown ...
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.
Castling is shown as a king move. Squares are designated from White's side of the board, files from left to right and ranks from nearest to farthest. The Rutherford code first converted the move into a number and then converted the move number into a composite Latin word. It could also transmit moves of two games at the same time.