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Re: [Bug-gnubg] Bug - Multiple errors in rollouts.
From: |
Jim Segrave |
Subject: |
Re: [Bug-gnubg] Bug - Multiple errors in rollouts. |
Date: |
Thu, 16 Oct 2003 20:11:03 +0200 |
User-agent: |
Mutt/1.4.1i |
On Thu 16 Oct 2003 (17:28 +0000), Joern Thyssen wrote:
> On Wed, Oct 15, 2003 at 08:24:15PM -0400, Eberlein, Robert (REBERLEI) wrote
> > I rolled out the same position using three Windows versions of gnubg:
> > 0.14-dev 1.1379, 0.14-dev 1.1399, and 0.14-dev 1.1427. To my dismay, as the
> > version number of gnubg increased, the displayed results were progressively
> > worse! I have attached the rollouts as files: Rollout_1_1379.sgf,
> > Rollout_1_1399.sgf and Rollout_1_1427.sgf
> >
> [snip]
> > Because the best way to win is to close out two checkers, gnubg must break
> > the prime to execute a trap play, if the two checkers make an anchor.
> > Therefore, I expected gnubg to lose some gammons and backgammons if user
> > gets lucky, and version 1.1379 seemed to give reasonable results. Bug #1 -
> > Both of the later versions show zero for the lost gammons and lost
> > backgammons. In addition, the standard error displayed for both lost
> > gammons and lost backgammons is insanely large and increases as the rollout
> > proceeds.
>
> I've committed a fix.
Wonderful - I'd just added some debugging printf's to see what was
happening and wasn't looking forward to watching stacks of numbers
going around.
--
Jim Segrave address@hidden