The "Quack Quack" Guy
He's known as X-22 because he was the 22nd player on the list when he won a big backgammon tournament.
X-22 wouldn't reveal his last name until a passing tournament director told everyone. Once the players found out, he treated them to a Triple Quack followed by a Rainbow Bet -- another Magriel specialty. It's a bet with one of each chip. One orange, one yellow, one blue, and one black makes 6,600. X-22 is quite the character.