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XG cube-position bug for + and ++?

Posted By: Jeremy Bagai
Date: Wednesday, 8 August 2018, at 12:59 a.m.

Can there be a reason for the Double/Take equity to change when cube goes from centered to owned?





White is Player 2

score: 0
pip: 99
Unlimited Game
pip: 76
score: 0

Blue is Player 1
XGID=aBBBBCC----------c-ccbcA--: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: 75.91% (G:8.75% B:0.03%) 76.16% (G:8.39% B:0.03%)
Opponent Winning Chances: 24.09% (G:1.75% B:0.05%) 23.84% (G:1.76% B:0.05%)
Cubeless Equities +0.588 +1.179
Cubeful Equities
No double:+0.699 (-0.290)
Double/Take:+0.990
Double/Pass:+1.000 (+0.010)
Best Cube action: Double / Take

eXtreme Gammon Version: 2.10
White is Player 2

score: 0
pip: 99
Unlimited Game
pip: 76
score: 0

Blue is Player 1
XGID=aBBBBCC----------c-ccbcA--:1:1:1:00:0:0:0:0:10
Blue on roll, cube action?

Analyzed in XG Roller++ No redouble Redouble/Take
Player Winning Chances: 75.75% (G:8.84% B:0.03%) 76.02% (G:8.44% B:0.03%)
Opponent Winning Chances: 24.25% (G:1.80% B:0.05%) 23.98% (G:1.80% B:0.05%)
Cubeless Equities +0.585 +1.173
Cubeful Equities
No redouble:+0.717 (-0.263)
Redouble/Take:+0.980
Redouble/Pass:+1.000 (+0.020)
Best Cube action: Redouble / Take

eXtreme Gammon Version: 2.10

.990 after DT when cube is centered, but .980 after DT when cube starts at 2. Can't be right, can it?

Clearly the ND equity should change, with cube ownership and all. But DT?

No disparity at 2, 3, or 4-ply, but similar disparity at Roller + and Roller ++.

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