I've played knightmare chess before with my neighbor. It's interesting. In the beginning of the game he had a card that took away my queen so I just resigned because I didn't have any good cards. I didn't like the game. But I decided to keep playing it with him, and it's pretty cool. even losing your queen isn't hopeless because the cards can change anything. The best card is called warlord, it lets your king move two squares instead of one.