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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

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