Artificial castling is a maneuver in which a king or rook that has lost the right to castle (because it has moved) does so through a sequence of moves, rather than one special move. Though it usually takes many turns and can be easily foiled with check, this kind of castling can be just as useful as when it is done "naturally". Theoretically, with the king and rook on their original squares, artificially castling requires at least three moves to accomplish correctly.

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