
If he is unable to make any of the above moves, the king is said to be checkmated and the game ends is favor of the opponent. CASTLING: Castling is a compound move of the king and one rook (formally called ‘castle) that may be made, if at all, only once in a game. It is legal if neither the king nor the rook has yet moved. If all the squares between them on the rank are vacant, and no adverse piece commands two squares nearest the king on the side on which castling is to be carried out, and if