Castling

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Castling is a composite move of King and Rook at the same time. In standard chess it consists of moving a king two squares towards the rook and executing a jump of a rook over the king.

=Rules= The prequisites for doing it are as follows:
 * the king and the relevant rook must not be moved, considered as castling rights inside a chess position
 * the king must not be in check
 * no square between king's start and final square may be controlled by the enemy

=Chess960= In Chess960 castling is a move reaching the position just like after standard chess castling, which may be achieved by (a) moving the king to c1 or g1 ant then executing a jump by relevant rook (b) jumping with the rook over a king already placed on c1 or g1 (c) interchanging the positions of king and rook.

=Shogi= A formation achieved after castling is called a castle. This is often contrasted with a castle in the game of Shogi, requiring several moves to complete, but it seems wrong, since chess also has several standard defensive castle formations - like the one after fianchetto of a king's bishop or the one with a knight on g7, often achieved in the Old Benoni. For that reason it might be interesting to use shogi programming concepts of a castle map and an attack map in chess.

=See also=
 * Algebraic Chess Notation - Castling
 * Castling rights
 * King Safety
 * Novag Micro Chess - Castling bug, CPWTIPC 1981

=Forum Posts=

1982

 * Re: bug in chess program by Bruce C. Wright @ Duke University, net.chess, December 2, 1982
 * Re: Origin of Castling by Bruce C. Wright @ Duke University, net.chess, December 4, 1982

2000 ...

 * Castling legality check by mjlef, Winboard Forum, January 04, 2007
 * Saving castling states and en passant history by Eric Lang, CCC, November 27, 2008 » En passant
 * 0x88 FRC castle questions by Daniel Uranga, Winboard Forum, December 12, 2009 » Chess960

2010 ...

 * Castling legality check by Stef Luijten, CCC, May 03, 2011
 * Castling long by Lyudmil Tsvetkov, CCC, August 05, 2013
 * Castling: A counter-intuitive result by Steven Edwards, CCC, September 03, 2013
 * Abundance of castling vs en passant rights by Kirill Kryukov, CCC, April 14, 2014 » En passant
 * Castling Evaluation by Dennis Sceviour, CCC, August 02, 2016 » King Safety

=External Links=
 * Castling from Wikipedia
 * Artificial castling from Wikipedia

=References=

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