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[Bug-gnubg] Re: GNU in bearoff races

From: Joseph Heled
Subject: [Bug-gnubg] Re: GNU in bearoff races
Date: Sun, 27 Oct 2002 09:43:30 +1300

> Neil Kaz wrote:
> Here's a typical position to judge how well GNU does bearing off. Does GNU
> have and use a database when all checkers are in the home board ?
> Anyhow.. GNU thinks and Snowie's database both judge the equity here to be
> -.125 while long rollouts with both programs result in 44.05% wins which is an
> equity of -.119.
> This is bcuz the rollout finds desparation plays that set up final doubles in
> the last couple of turns when way behind.


I don't think you need a long rollout for this position. I think I can give you
the "ultimate rollout". A 16ply gives me 0.440498 (or -0.119004 eq). It takes
only a few seconds for a 16 ply because of the aggressive caching of previously
reached positions. Of course, this can be wrong as well since it might misplay a
little on the way.


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