The Crawford rule is named after John R. Crawford.
When either of the players is just short of one point from the victory, then the opponent can not announce a double in the subsequent game.
This particular game, where double is prohibited, is called the Crawford game. Scientifically, even if a double is announced and accepted by the player approaching the victory, it will be nullified because point 1 or 2 can create hardly any difference for him. Rather the double may benefit the opponent who is losing. But if the Crawford game remains indecisive in terms of final win or loss, then all the rules of double and redouble will be back in place in the subsequent games. This rule has been accepted all over the globe. Even United States Backgammon Tournament Rules & Procedures follow Crawford rule at the closing stage of any tournament.
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