Castling is a special move that allows movement of both the king and rook. This is the only time that two pieces may be moved in a single turn. To castle, a king is first moved two spaces to the left or right of its original square. The rook that the king moves toward is then moved from its original space to a space adjacent to the king but on the opposite side. Castling is not allowed under the following conditions:
- If either the king or the selected rook has been moved in the game. Both pieces must be in their original places on the board.
- If there are pieces between the king and the rook. The space must be entirely open without any intervening pieces.
- If the king is in check, or if castling would move the king through any spaces that would put it in check.

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