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From: | Ned Cross |
Subject: | [bug-gnubg] bug in gammon-save eval |
Date: | Fri, 25 Apr 2003 13:45:20 -0700 |
GNU is choosing a move that loses more
gammons because it has a fantasy that there are actual game-winning chances from
this position. Very strange.
-Ned
black (O, 10 pts) vs. white (X, 1 pts)
(Match to 15)
Game number 6
Match Information:
black's rating: n/a
white's rating: n/a Date: n/a Event: n/a Round: n/a Place: n/a Annotator: n/a Comments: n/a Move number 47: X to play 34 GNU Backgammon Position ID:
HQAAYLYbsgAAAA
Match ID : UYnxAaAACAAA +13-14-15-16-17-18------19-20-21-22-23-24-+ O: black | X | | O O | OOO 10 points | | | O | OO | | | O | OO | | | | OO | | | | OO v| |BAR| | 15 point match | | | | | | | | | | | X | | X | | X X X X X | Rolled 34 | X X | | X X X X X | 1 point +12-11-10--9--8--7-------6--5--4--3--2--1-+ X: white (Cube: 2) Pip counts: O 7, X 90 * white moves 13/6
Cube analysis
2-ply cubeless equity -1.630 (Money: -1.936) 0.000 0.000 0.000 - 1.000 0.936 0.000 Cubeful equities: 2-ply cubeful 100% speed [world class] 1. No double -1.630 2. Double, pass +1.000 ( +2.630) 3. Double, take -1.894 ( -0.264) Proper cube action: No redouble, take (9.1%) Rolled 34
(-0.023):
1. Cubeful 2-ply 13/10 12/8 Eq.: -1.629 0.008 0.002 0.000 - 0.992 0.974 0.000 * 2. Cubeful 2-ply 13/6 Eq.: -1.647 ( -0.018) 0.000 0.000 0.000 - 1.000 0.962 0.000 3. Cubeful 2-ply 12/9 10/6 Eq.: -1.663 ( -0.034) 0.000 0.000 0.000 - 1.000 0.986 0.000 4. Cubeful 2-ply 13/9 12/9 Eq.: -1.663 ( -0.034) 0.000 0.000 0.000 - 1.000 0.986 0.000 5. Cubeful 2-ply 12/5 Eq.: -1.665 ( -0.036) 0.000 0.000 0.000 - 1.000 0.988 0.000 6. Cubeful 2-ply 13/9 10/7 Eq.: -1.667 ( -0.038) 0.000 0.000 0.000 - 1.000 0.991 0.000 Output generated Fri Apr 25 13:38:59 2003 by GNU Backgammon 0.13-devel (Text Export version 1.38) |
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