Known as X-22 on the backgammon circuit,[REF] Magriel has arguably won more major backgammon tournaments than any other player in the world [REF].
The sobriquet X-22 originates from Magriel's simulation of a real backgammon tournament (compare simultaneous exhibition in chess) with 64 boards, designated X-1 through x-64, in which the player designated "X-22" has eventually won [REF].