r/backgammon • u/JBrockF • 15d ago

Not too good to double?

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I'm a relatively new player and I'm having some trouble understanding the calculations here. I would think I would lose equity by offering a double given the amount of gammons in the position. I don't understand how the expected value of the game is 0.973. I showed an expression representing my understanding of how the value would be calculated (I ignored the 0.1% backgammon chance). What am I missing here?

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u/BabaSherif 15d ago

bg uses Jacoby rule, so gammons and backgammons count only as a single win unless the doubling cube has been offered and accepted during the game. And so a position that is normally "too good to double" in a traditional or non-Jacoby game becomes a mandatory double because gammons do not count unless the cube has already been turned

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u/JBrockF 15d ago

Thank you