Use this worksheet to teach your little ones some of the rules guiding how a king can operate across the chess board. The king cannot castle if the king or the rook is not on their starting squares. The king cannot castle if the king or the rook has moved already. The king cannot castle if there is any other piece between the rook and the king. If your child understands these rules, ask them to circle the king and the rook that can castle in the picture.