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GNU bug also

Posted By: Neil Robins
Date: Friday, 6 November 2015, at 8:35 a.m.

In Response To: Example of recently discussed XG bug (Timothy Chow)

During analysis of match I got:

Match to 9 points - Paul Weaver 0, Petko 0

Paul Weaver72

2X2X3X3X2X2X ' ' ' ' '2O

 '1X2O2O3O3O '2O '1O ' '
Petko99
Position ID: 290GABBsdyYGAA Match ID: UQkgAQAAAAAE

• Petko doubles

Alert: wrong double ( -0.332)! [very bad]

Cube decision
4-ply cubeless equity +0.410(Money: +0.410)
0.704 0.026 0.001 - 0.296 0.024 0.000
Cubeful equities:
1.No double +1.332
2.Double, take +1.329 -0.002
3.Double, pass +1.000 -0.332
Proper cube action:Too good to redouble, pass

Which reanalysed to the rather more sensible:

Match to 9 points - Paul Weaver 0, Petko 0

Paul Weaver72

2X2X3X3X2X2X ' ' ' ' '2O

 '1X2O2O3O3O '2O '1O ' '
Petko99
Position ID: 290GABBsdyYGAA Match ID: UQkgAQAAAAAE

• Petko doubles

Cube decision
4-ply cubeless equity +0.417(Money: +0.410)
0.704 0.026 0.001 - 0.296 0.025 0.000
Cubeful equities:
1.Double, take +0.881
2.Double, pass +1.000 +0.119
3.No double +0.750 -0.131
Proper cube action:Redouble, take





White is Paul Weaver

score: 0
pip: 72
9 point match
pip: 99
score: 0

Blue is Petko
XGID=--aBBCC-B-A--B-----bbccbb-:1:1:1:00:0:0:0:9:10
Blue on roll, cube action?
Analyzed in Rollout No redouble Redouble/Take
Player Winning Chances: 72.29% (G:2.92% B:0.06%) 72.91% (G:2.94% B:0.07%)
Opponent Winning Chances: 27.71% (G:3.38% B:0.04%) 27.09% (G:3.81% B:0.05%)
Cubeless Equities +0.441 +0.934
Cubeful Equities
No redouble:+0.755 (-0.068)±0.004 (+0.751..+0.759)
xg Redouble/Take:+0.823±0.006 (+0.817..+0.828)
Redouble/Pass:+1.000 (+0.177)
Best Cube action: Redouble / Take
Rollout details
2592 Games rolled with Variance Reduction.
Dice Seed: 71284
First 2 moves: 4-ply, cube decisions: XG Roller+
Remaining moves: 3-ply, cube decisions: XG Roller
Double Decision confidence:100.0%
Take Decision confidence:100.0%
Duration: 2 minutes 44 seconds

eXtreme Gammon Version: 2.10, MET: Rockwell-Kazaross

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