The strangest thing to happen to chess in 5,000 years! Knightmare Chess is chess played with cards, as each card breaks the rules in a wild and unpredictable way, giving the game more twists and turns than a roller coaster. Some cards alter single moves, while others change the fundamental rules of the game. The original game of chaos on the chessboard just added a new dimension of unpredictable fun! By Steve Jackson Games.