Dirty Seven

A shedding card game for two: seven cards each, one face up on the pile, and the first player to empty a hand wins. You discard onto the pile when you can match it and draw from the stock when you cannot, which sounds like luck until you notice how much of the game is about holding the right card back a turn longer. It plays in about three minutes, and like most card games built for two it is far better against a person than against a program.