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[Bug-gnubg] Possible cube evaluation problem
From: |
Terje Pedersen |
Subject: |
[Bug-gnubg] Possible cube evaluation problem |
Date: |
Mon, 19 Mar 2018 11:30:28 +0100 |
Hi!
One of my users was upset that a position which XG evaluated as
Double/Take was evaluated to a No Double/Take by Gnu. The score 2A-5A
may make the cube action a bit tricky.
XGID=-AAbB-EBBB-----a--acbbbb--:0:0:1:00:3:0:0:5:10
Analyzed in 4-ply
Player Winning Chances: 74.79% (G:2.12% B:0.01%)
Opponent Winning Chances: 25.21% (G:1.40% B:0.01%)
Cubeless Equities: No Double=+0.5233, Double=+1.6234
Cubeful Equities:
No double: +0.8108 (-0.0040)
Double/Take: +0.8149
Double/Pass: +1.0000 (+0.1851)
Best Cube action: Double / Take
eXtreme Gammon Version: 2.19.211.pre-release, MET: Kazaross XG2
Gnu:
tu0iAAxlvm0AAA:cAmgAAAAGAAE
Cube analysis
2-ply cubeless equity +0.506 (Money: +0.487)
0.739 0.021 0.000 - 0.261 0.012 0.000
Cubeful equities:
1. No double +0.912
2. Double, pass +1.000 ( +0.088)
3. Double, take +0.742 ( -0.169)
Proper cube action: No double, take (65.7%)
The difference is fairly big in this case. I checked a few more
positions in the database and it seems that Gnu and XG agrees for the
most part but not always. Some other examples where they disagree:
XGID=--ADBBBbB---cB----bbb-b-b-:0:0:1:00:7:4:0:9:8
XGID=-ABbBBCC----bB-----bbbbba-:0:0:1:00:5:2:0:7:8
XGID=--ACBcC-BB--bB-----b-cbab-:0:0:1:00:11:8:0:13:8
XGID=-B-aCCC-C---aA------bdbcb-:0:0:1:00:7:4:0:9:8
XGID=-C-CBCB-c----B-a-abb-bb-b-:0:0:1:00:23:20:0:25:8
XGID=-a-BB-C-BBA-bCa--c-db-b---:0:0:1:00:9:6:0:11:8
Is it a bug or a feature? Hard to tell! :-)
Best regards,
TP
- [Bug-gnubg] Possible cube evaluation problem,
Terje Pedersen <=