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The most bizarre XG evaluation I have ever seen

Posted By: Timothy Chow
Date: Saturday, 12 January 2019, at 8:52 p.m.

I had two or three instances of XG running on my PC. I don't remember exactly what all of them were doing, but I started a match on one of them and played it to completion. When the match was over, I did a "World Class" analysis of the session. Imagine my surprise when I began looking over the match and found myself charged with the following triple whopper before the first game even began:




Exporting the position to HTML explained part of the mystery but by no means all of it:







White is eXtremeGammon

score: 0
pip: 167
7 point match
pip: 167
score: 0

Blue is Me
XGID=-b----E-C---eE---c-e----B-:0:0:1:42:0:0:0:7:10
Blue to play 42

1.Book18/4 6/4eq: +0.178
Player:
Opponent:		53.77% (G:16.20% B:0.70%)
46.23% (G:11.84% B:0.55%)
2.Book124/20 13/11eq: +0.010 (-0.168)
Player:
Opponent:		50.08% (G:13.61% B:0.65%)
49.92% (G:13.40% B:0.57%)
3.Book124/22 13/9eq: +0.008 (-0.170)
Player:
Opponent:		49.88% (G:13.84% B:0.57%)
50.12% (G:13.07% B:0.51%)
4.Book113/11 13/9eq: -0.001 (-0.180)
Player:
Opponent:		49.44% (G:14.70% B:0.67%)
50.56% (G:13.43% B:0.73%)
5.Book224/18eq: -0.044 (-0.223)
Player:
Opponent:		49.35% (G:12.23% B:0.60%)
50.65% (G:14.23% B:0.57%)		Conf.: ± 0.004 (-0.048...-0.041)
6.Book113/7eq: -0.085 (-0.263)
Player:
Opponent:		47.84% (G:13.10% B:0.61%)
52.16% (G:14.49% B:0.75%)
7.XG Roller+Cannot Moveeq: -0.121 (-0.300)
Player:
Opponent:		47.31% (G:12.43% B:0.53%)
52.69% (G:14.60% B:0.66%)
8.2-ply24/22 24/20eq: -0.035 (-0.213)
Player:
Opponent:		49.37% (G:11.98% B:0.53%)
50.63% (G:13.41% B:0.44%)
9.2-ply13/9 6/4eq: -0.054 (-0.233)
Player:
Opponent:		48.72% (G:13.39% B:0.63%)
51.28% (G:14.43% B:0.93%)
10.2-ply24/20 6/4eq: -0.070 (-0.248)
Player:
Opponent:		48.38% (G:12.02% B:0.47%)
51.62% (G:13.65% B:0.61%)
1 Generated by GameSite 2000, Ltd on 5/21/2011 using eXtreme Gammon 2.00
Analyzed in XG Roller++

2 Generated by Steven Carey on 8/6/2012 using eXtreme Gammon 2.00
20736 Games rolled with Variance Reduction.
Dice Seed: 10085598
Moves: 3-ply, cube decisions: XG Roller

eXtreme Gammon Version: 2.19.207.pre-release, MET: Kazaross XG2

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