John R. Crawford

John Yocum Randolph Crawford (August 4, 1915 – February 14, 1976) was an American bridge and backgammon player.

In bridge, he was a member of United States teams that won the first three Bermuda Bowls, or world championships, in 1950, 1951 and 1953; a wholly new team represented the US in 1954. In backgammon, Crawford is known as the inventor of the "Crawford rule", a regulation that restricts use of the doubling die in match play. Provided by Wikipedia
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