Jacoby Rule is not in use in match games, which is the most common type of play in backgammon tournaments, as well as in online backgammon websites. In match play, the participants play a series of successive games until either player achieves a set number of points. Instead of the Jacoby Rule, backgammon matches use the Crawford Rule, according to which, when one of the players is missing one point to win the match, the use of the doubling cube is forbidden in the following game.
The Jacoby Rule is named after its creator, the famous bridge and backgammon player Oswald Jacoby who won the 1972 World Backgammon Championship. The object of the rule is to speed up the play by limiting the players’ possibilities. For example, the dilemma whether to play for the gammon becomes irrelevant once the Jacoby Rule is used.
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