Castling

A special move in which the king moves two squares toward a rook and that rook crosses to the king's other side.

Castling toward the kingside rook, leaving the king on g1 or g8 and the rook on f1 or f8.

Castling toward the queenside rook, leaving the king on c1 or c8 and the rook on d1 or d8.

A position state showing whether a player still retains the legal right to castle with each rook.