Editing Castling (section)

===Tournament rules===
{{See also|Rules of chess|Touch-move rule}}

Under FIDE rules and USCF rules, and enforced in most [[chess tournament|tournaments]], castling is considered a king move, so the king must be touched first; if the rook is touched first, a rook move must be played instead. As usual, the player may choose another legal destination square for the king until releasing it. When the two-square king move is completed, however, the player is committed to castling if it is legal, and the rook must be moved accordingly. The entire move must be completed with one hand. A player who attempts to castle illegally must return the king and rook to their original squares and then make a legal king move if possible (which may include castling on the other side). If there is no legal king move, the touch-move rule does not apply to the rook.{{sfn|Just|2019|loc=chapter 1, section 10I}}{{sfn|FIDE|2023|loc=article 4}}

These tournament rules are not commonly enforced in {{chessgloss|friendly game|informal play}} nor commonly known by casual players.<ref>[[William Hartston]] notes in ''Teach Yourself Chess'' that "most chess players refrain from demonstrations of ambidexterity."</ref>