The crossword solution for the term MOVES ROOK AND KING SIMULTANEOUSLY is CASTLES. Castles are large fortified structures that were built in the Middle Ages to protect and provide a residence for royalty and their court. Castles were often surrounded by a moat and had high walls and towers. In chess, the rook and king pieces can move simultaneously in a castle move, which allows the king to move two squares horizontally or vertically and the rook to move over the king to the square beyond it.