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Re: [Bug-gnubg] Too good to double when a gammon is impossible?!
From: |
Christian Anthon |
Subject: |
Re: [Bug-gnubg] Too good to double when a gammon is impossible?! |
Date: |
Fri, 21 Aug 2009 23:52:39 +0200 |
This happens when the evaluation is bad enough to allow for bad takes later.
Christian.
On Fri, Aug 21, 2009 at 9:48 PM, Timothy Y. Chow<address@hidden> wrote:
> I just rolled out a cube decision and gnubg evaluated "no double" at greater
> than +1.000 equity despite the fact that a gammon was no longer possible.
> Below is the text output; I can email the .sgf file if anyone
> wants it.
>
> Tim
>
>
> The score (after 0 games) is: gnubg 0, tchow 0
> Match Information:
>
> Date: 08/21/2009
> Move number 1: gnubg on roll, cube decision?
>
> GNU Backgammon Position ID: bgAAULZtEwAiAA
> Match ID : AQEAAAAAAAAA
> +12-11-10--9--8--7-------6--5--4--3--2--1-+ O: gnubg (Cube: 2)
> | O O | | O O O O O X | 0 points
> | O | | O O O O O | On roll
> | | | |
> | | | |
> | | | |
> ^| |BAR| |
> | | | | X
> | | | | X
> | | | X | XX
> | | | X X | XX
> | | X | O X X O | XX 0 points
> +13-14-15-16-17-18------19-20-21-22-23-24-+ X: tchow
> Pip counts: O 108, X 61
>
> * gnubg doubles
>
> Alert: wrong double ( -0.167)!
> Rollout details:
> Player gnubg owns 2-cube:
> 0.828 0.000 0.000 - 0.172 0.007 0.001 CL +0.647 CF +1.167
> [0.002 0.000 0.000 - 0.002 0.000 0.000 CL 0.004 CF 0.010]
> Player tchow owns 4-cube:
> 0.859 0.000 0.000 - 0.141 0.006 0.001 CL +1.422 CF +1.325
> [0.002 0.000 0.000 - 0.002 0.000 0.000 CL 0.008 CF 0.010]
> Full cubeful rollout with var.redn.
> 1296 games, Mersenne Twister dice gen. with seed 866958217 and quasi-random
> dice
> Play: 0-ply cubeful [expert]
> Cube: 0-ply cubeful [expert]
>
>
>
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