When a contest is between 2 players only, it is referred to as Heads-up.  Heads-up Shoot-out tournaments are a good way to improve your winning game, as you will end up facing one opponent most of the time to win any tournament.  The rules are the same for Heads-up play with the exception that the player with the Dealer button posts the small blind and will act first pre-flop then last for the remainder of the hand.  The player who posts the big blind is dealt first.