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Another one

Posted By: Bob Koca
Date: Sunday, 23 August 2026, at 8:24 p.m.

In Response To: doubling and volatility search for examples (Bob Koca)

Could probably get a more drastic difference using Jacoby rule, but this example was without it.

Initial position is a small no double and has equity .5704





White is Player 2

score: 0
pip: 80
Unlimited Game
pip: 72
score: 0

Blue is Player 1
XGID=--EBBBBb-----B-----cbaacc-:0:0:1:00:0:0:0:0:10
Blue on roll, cube action?

Analyzed in XG Roller++ No double Double/Take
Player Winning Chances: 68.039% (G:4.347% B:0.151%) 68.284% (G:3.988% B:0.137%)
Opponent Winning Chances: 31.961% (G:0.530% B:0.008%) 31.716% (G:0.568% B:0.008%)
Cubeless Equities +0.4004 +0.8023
Cubeful Equities
No double:+0.5704
Double/Take:+0.5575 (-0.0130)
Double/Pass:+1.0000 (+0.4296)
Best Cube action: No double / Take
Percentage of wrong pass needed to make the double decision right: 2.8%

eXtreme Gammon Version: 2.10

After 65 13/2 and 51 18/12* it is a .08 error to not double even though equity has gone done by .1888





White is Player 2

score: 0
pip: 74
Unlimited Game
pip: 73
score: 0

Blue is Player 1
XGID=--FBBBBa-----a-----cbaaccA:0:0:1:00:0:0:0:0:10
Blue on roll, cube action?

Analyzed in XG Roller++ No double Double/Take
Player Winning Chances: 58.045% (G:19.174% B:0.721%) 58.237% (G:18.949% B:0.686%)
Opponent Winning Chances: 41.955% (G:1.702% B:0.021%) 41.763% (G:1.650% B:0.019%)
Cubeless Equities +0.3426 +0.6888
Cubeful Equities
No double:+0.2999 (-0.0817)
Double/Take:+0.3816
Double/Pass:+1.0000 (+0.6184)
Best Cube action: Double / Take

eXtreme Gammon Version: 2.10

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