Description from the publisher:
The Castle-Mate Game Cards are incorporated into the normal game of chess (World Chess Federation, FIDE, rules apply). White, without taking a card, makes the first move. Black has the option to make a regular chess move, or take a card.
Take a card and let the fun begin.
With every turn, the players have an option to make a regulation chess move or take a card. If the King is in check, the player cannot take a card and must use the turn, to move the King to safety. A player can use any of the cards, he or she currently possesses, to aid in the King’s safety.
The Castle-Mate cards are designed to appeal to Chess Players of any age and skill. The level of sophistication is really determined by the skill of the players. However, Castle-Mate adds an unpredictable element to the game: “Luck of the Draw”.
Selection of a particular card, at any given moment, can dramatically alter the outcome of the game. As in the regular game, Check-mate wins. Resignations, Stalemates and Draws are applicable, as stated by World Chess Federation rules. You can also win by drawing specific cards at the right moment.