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Re: [Bug-gnubg] Crawford Cubeful equity not matching cubeless during rol

From: Jim Segrave
Subject: Re: [Bug-gnubg] Crawford Cubeful equity not matching cubeless during rollouts.
Date: Thu, 6 May 2004 12:50:50 +0200
User-agent: Mutt/1.4i

On Wed 05 May 2004 (15:08 -0400), Eberlein, Robert (REBERLEI) wrote:
> I have noticed bizarre results during rollouts of the Crawford game for
> matches.  The cubeless and cubeful equities should always match, since
> the cube cannot be turned.
> They seem to start out that way, but as the rollout proceeds each
> alternative getting rolled out on my Windows 2000 machine eventually
> shows a significant discrepancy between the cubeless and the cubeful
> equities.  I think the cubeful equities are messed up.  The simplest way
> to reproduce the problem is to start a 3 point match, resign a gammon on
> move 1 of game 1, and then analyze a 43 opener in game 2.  My rollouts
> were 0-ply (expert level) untruncated, with variance reduction.  I used
> gnubg 0.14.2 - dev 1.1578 040503.

Is it true that the cubeful and cubeless should be the same? The value
of a gammon to the trailer is very much a function of how much they
are trailing by. For example, if you are 3-away 1-away Crawford and
win, the next game 2-away 1-away is going to be played for DMP in a
cubeful environment, so in fact winning the Crawford game makes you
50% to win the match. That's not so in a cubeless match

Jim Segrave           address@hidden

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