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[Bug-gnubg] Bug: Double/Beaver
From: |
Christopher D. Yep |
Subject: |
[Bug-gnubg] Bug: Double/Beaver |
Date: |
Wed, 20 Aug 2003 02:14:22 -0400 |
Windows XP, GUI version
Version 0.14-devel 1.1282 030818 (build Aug 19 2003)
gnubg misinterprets the following evaluation:
GNU Backgammon Position ID: 27ZCFADbtgEDQA
Match ID : cAkAAAAAAAAA
+24-23-22-21-20-19------18-17-16-15-14-13-+ O: gnubg
| O O O O O O | | O O X | 0 points
| O O O O O | | X |
| | | |
| | | |
| | | |
| |BAR| |v (Cube: 1)
| | | |
| | | |
| | | |
| X X X X X X | | | On roll
| X X X X X X | X | O O | 0 points
+-1--2--3--4--5--6-------7--8--9-10-11-12-+ X: Chris
Cube analysis
2-ply cubeless equity -0.038
38.3% 28.2% 6.2% - 61.7% 14.7% 0.0%
Cubeful equities:
1. Double, take -0.236
2. Double, pass +1.000 ( +1.236)
3. No double -0.389 ( -0.153)
Proper cube action: Double, beaver
[Jacoby rule used above]
Correct cube action, based on the above numbers is actually
no-double/beaver. Double/beaver is worth -.472 to X which is worse than
the -.389 he can get from holding the cube.
Note: As an aside, my rollouts of the position are showing that the
position *may* (with only low statistical significance so far) actually be
a correct double/beaver, with double/take around -.18 or -.19 (so
double/take/beaver around -.36 or -.38). (However this isn't relevant to
the bug report.)
Chris
- [Bug-gnubg] Bug: Double/Beaver,
Christopher D. Yep <=
- Re: [Bug-gnubg] Bug: Double/Beaver, Joern Thyssen, 2003/08/21
- Message not available
- Re: [Bug-gnubg] Bug: Double/Beaver, Christopher D. Yep, 2003/08/22
- Re: [Bug-gnubg] Bug: Double/Beaver, Joern Thyssen, 2003/08/21
- Re: [Bug-gnubg] Bug: Double/Beaver, Christopher D. Yep, 2003/08/22
- Re: [Bug-gnubg] Bug: Double/Beaver, Joern Thyssen, 2003/08/22
- Re: [Bug-gnubg] Bug: Double/Beaver, Christopher D. Yep, 2003/08/22
- Re: [Bug-gnubg] Bug: Double/Beaver, Joern Thyssen, 2003/08/22
- [Bug-gnubg] Japanese Locale Problem for Windows 2000, Yoshito Takeuchi, 2003/08/23