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Strange XG Evaluation

Posted By: misja
Date: Sunday, 30 October 2011, at 2:06 p.m.

XG's 3-ply and 4-ply evaluations say that everything but 6/4 2/1 is a blunder. I included the rollout because it shows what one would expect; all moves have equities close to each other.
I wonder why XG evaluates 6/4 2/1 as so much stronger than the other moves?




White is Player 2

score: 3
pip: 105
15 point match
pip: 91
score: 12

Blue is Player 1
XGID=--BACBBbC----Bb---abbbbb--:1:-1:1:21:12:3:0:15:10
Blue to play 21

1.3-ply6/4 2/1eq: +0,090
Player:
Opponent:
68,07% (G:2,36% B:0,02%)
31,93% (G:1,94% B:0,04%)
2.3-ply4/1eq: +0,006 (-0,084)
Player:
Opponent:
64,86% (G:1,03% B:0,01%)
35,14% (G:1,39% B:0,01%)
3.3-ply5/3 2/1eq: +0,006 (-0,085)
Player:
Opponent:
64,89% (G:1,18% B:0,01%)
35,11% (G:1,43% B:0,01%)
4.3-ply3/1 2/1eq: -0,002 (-0,092)
Player:
Opponent:
64,56% (G:0,96% B:0,01%)
35,44% (G:1,37% B:0,01%)
5.3-ply6/3eq: -0,003 (-0,093)
Player:
Opponent:
64,62% (G:0,96% B:0,01%)
35,38% (G:1,47% B:0,01%)

eXtreme Gammon Version: 2.01, MET: Kazaross XG2







White is XG Roller+

score: 3
pip: 105
15 point match
pip: 91
score: 12

Blue is Misja
XGID=--BACBBbC----Bb---abbbbb--:1:-1:1:21:12:3:0:15:10
Blue to play 21

1.Rollout14/1eq: +0,004
Player:
Opponent:
65,27% (G:0,73% B:0,00%)
34,73% (G:1,12% B:0,02%)
Conf.: ± 0,006 (-0,002...+0,010) - [59,5%]
Duration: 3 minutes 12 seconds
2.Rollout15/3 2/1eq: +0,003 (-0,001)
Player:
Opponent:
65,24% (G:0,71% B:0,01%)
34,76% (G:1,16% B:0,03%)
Conf.: ± 0,006 (-0,003...+0,009) - [40,3%]
Duration: 2 minutes 59 seconds
3.Rollout13/1 2/1eq: -0,007 (-0,011)
Player:
Opponent:
65,01% (G:0,69% B:0,00%)
34,99% (G:1,22% B:0,03%)
Conf.: ± 0,006 (-0,013...0,000) - [0,2%]
Duration: 2 minutes 46 seconds
4.Rollout16/4 2/1eq: -0,017 (-0,021)
Player:
Opponent:
65,09% (G:0,86% B:0,01%)
34,91% (G:1,68% B:0,05%)
Conf.: ± 0,007 (-0,024...-0,010) - [0,0%]
Duration: 3 minutes 32 seconds
5.Rollout16/3eq: -0,022 (-0,026)
Player:
Opponent:
64,88% (G:0,87% B:0,01%)
35,12% (G:1,48% B:0,05%)
Conf.: ± 0,006 (-0,028...-0,016) - [0,0%]
Duration: 1 minute 40 seconds
1 1296 Games rolled with Variance Reduction.
Moves: 3-ply, cube decisions: XG Roller

eXtreme Gammon Version: 2.01, MET: Kazaross XG2

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