For Jacoby Rule we have a term and definition in Backgammon.

Jacoby Rule (Backgammon)

[Named for Oswald Jacoby, who proposed the rule.] A rule popular in money play which says that gammons and backgammons (2) count only as a single game if neither player has offered a double during the game. The rule speeds up play by eliminating situations where a player avoids doubling so he can play on for a gammon. See post by Daniel Murphy.

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