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* the king must not be in check
* no square between king's start and final square may be controlled by the enemy
=Irreversibility=
While castling is [[Irreversible Moves|irreversible]] with respect to the [[Castling Rights|castling rights]] and resets the position index to determine [[Repetitions#RepetitionOfPositions|repetition of positions]], castling doesn't reset, but increments the [[Halfmove Clock|halfmove clock]] concerning the [[Fifty-move Rule|fifty-move rule]] <ref>[http://www.open-chess.org/viewtopic.php?f=3&t=2209 Half Move Clock Confusion] by HumbleProgrammer, [[Computer Chess Forums|OpenChess Forum]], January 10, 2013</ref> <ref>[http://www.horst-wandersleben.de/Wette.htm Computerschach - Eine Wette, die ich gerne verloren habe] by [[Horst Wandersleben]]</ref>.
=Chess960=
* [https://en.wikipedia.org/wiki/Castling Castling from Wikipedia]
: [https://en.wikipedia.org/wiki/Artificial_castling Artificial castling from Wikipedia]
* [http://www.horst-wandersleben.de/Wette.htm Computerschach - Eine Wette, die ich gerne verloren habe] by [[Horst Wandersleben]] (German) » [[Fifty-move Rule]] <ref>[[Dieter Bürßner]] found a game finished in a [[Fifty-move Rule|fifty-move rule]] draw, where [[Castling|castling]] occurred during the last fifty moves</ref>
=References=
<references />
'''[[Moves|Up one Level]]'''
