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[Bug-gnubg] Odd rollout results of classic reference position
From: |
ershaw |
Subject: |
[Bug-gnubg] Odd rollout results of classic reference position |
Date: |
Sun, 18 May 2003 16:22:13 +0100 |
Five off and one closed out is traditioanlly a take. A GnuBg rollout has it
as a pass. I've got no problem with that.
What is odd is that the equit of No DOuble is greater than 1. How can this
be? That would make it Too Good in a position where no gammons are possible.
This is yet another position where the doubler is seen to win more games by
doubling than by holding on to the cube. I would expect O to double X out in
some games if O has cube access. Therefore X ought to win less games if he
gives up the cube. Something seems wrong. Is it me?
--Ian
GNU Backgammon Position ID: tw0AANp2dwAAAA
Match ID : UQkAAAAAAAAA
+24-23-22-21-20-19------18-17-16-15-14-13-+ O: gnubg
O | O O O O | O | | 0 points
O | O O O O | | |
O | O | | |
O | | | |
O | | | |
| |BAR| |v
| | | |
| | | |
| X X X | | |
| X X X X X X | | | On roll
| X X X X X X | | | 0 points
+-1--2--3--4--5--6-------7--8--9-10-11-12-+ X: user (Cube: 2)
Cube analysis
Rollout cubeless equity +0.584
Cubeful equities:
1. Double, pass +1.000
2. Double, take +1.061 ( +0.048)
3. No double +1.013 ( +0.000)
Proper cube action: Redouble, pass
Rollout details:
Player user owns 2-cube:
0.792 0.000 0.000 - 0.208 0.000 0.000 CL +0.584 CF +1.013
[0.000 0.000 0.000 - 0.000 0.000 0.000 CL 0.001 CF +0.003]
Player gnubg owns 4-cube:
0.795 0.000 0.000 - 0.205 0.000 0.000 CL +1.181 CF +1.061
[0.001 0.000 0.000 - 0.001 0.000 0.000 CL 0.002 CF +0.003]
Full cubeful rollout with var.redn.
1296 games, seed 1206724736 using quasi-random dice and Mersenne Twister
Play and cube: 2-ply cubeful 100% speed [world class]
- [Bug-gnubg] Odd rollout results of classic reference position,
ershaw <=