polyglot en passant square by Marco Belli, CCC, September 12, 2013 » PolyGlot.Re: Causes for inconsistent benchmark signatures by Evert Glebbeek, CCC, March 27, 2013 » Forsyth-Edwards Notation.Komodo 3 and a minor bug by Jouni Uski, CCC, September 02, 2011.en passant and hash key calculation by Fred Hamilton, CCC, March 21, 2010.
#ENPASS IN CHESS PORTABLE#
Programmer bug hunt challenge by Ed Schröder, CCC, May 04, 2007 » Portable Game Notation.annoying en passant x-ray by Georg von Zimmermann, CCC, November 30, 2003.Fowell, CCC, February 27, 2000 » Castling Rights, Repetitions Does your program understand castling/en passant rights on 3x repetition by Richard A.Unique nodes, en passant and perfect hashing by Andreas Stabel, CCC, November 25, 1999.en-passant move generation by Larry Griffiths, CCC, February 06, 1999.Hash Tables - Should one store EP, Castling rights etc? by Steve Maughan, CCC, January 30, 1999 » Castling Rights, Transposition Table.IsiChess pushed its white pawn from b2 to b4 "between" the two advanced pawns a4 and c4 from Henk, allowing two possible en passant options. Gerd Isenberg had a special en passant experience with IsiChess at Aegon 1994 in the game versus Henk Arnoldus. Almost every chess programmer had various issues with it, most notable Louis Kessler with his Program Brute Force. The implementation of the en passant rule often caused subtle bugs.
The legality test should be best applied in making of the double pawn push, also considering updating Zobist keys to avoid dissimilarity of otherwise repeated positions if the first occurrence happened after a double pawn push with no en passant capture actually possible. The En passant Chess Move – a Chess Move in PassingĮn passant is a term that describes a move in the board game of chess, which loosely translated from French, means ‘in the pawn’s passing’ or ‘in passing’.8/6bb/8/8/R1pP2k1/4P3/P7/K7 b - d3 after d2-d4 En passant is a particular chess capture move made instantly after a chess player moves his or her pawn 2 squares forward from its starting position, and the opposition’s pawn could’ve captured it as if it had only moved 1 square forward. In this instance, the opposition’s pawn may, on the next move, capture the pawn in question as if taking it "as it passes" through the 1st square. The pawn’s resulting position would still be the same as if the pawn had only moved 1 square forward and the opposition’s pawn had captured normally. The En passant capture move must be executed on the very next turn, or the chess player loses his or her right to make this move. The En passant move is the only instance in the game of chess in which one chess piece captures another but does not move to the captured piece’s square. In a 3-fold chess repetition draw, with 2 positions whose pieces are all on the same squares, and where the same player must move, it is considered different if there is a chance to make an en passant capture move in 1 position but not in the other.
In either descriptive or algebraic chess notation, the letters “E.P.” or similar sometimes denotes en passant captures, but such descriptive notation is not always required. In algebraic notation, the chess move is noted as if the captured pawn progressed only 1 square, for example exf6 (or exf6 e.p.) The numbers and letters used would be determined by the square the pawn has moved to.
When looking at the history of chess, it is noted that the allowing of an en passant is 1 of the last large rule changes in European chess that occurred in the fourteenth or fifteenth century. Changes that occurred at roughly the same time were the introduction of the 2-square first move for pawns, the unlimited range for bishops and queens, and castling. The Asian chess variants do not feature any of these moves because they were separated from European chess prior to that period. The reason behind en passant was to stop the newly added 2 square first move for pawns from allowing players to evade capture by an opposition’s pawn.
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