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Re: [Bug-gnubg] New build of GNU Backgammon for Windows available!

From: nedc
Subject: Re: [Bug-gnubg] New build of GNU Backgammon for Windows available!
Date: Tue, 26 Oct 2004 11:24:53 -0700

I post here a reproducible case where 0.15 rollouts perform significantly poorer than 0.14. I have 2 .sgf files with the rollout results if you would like me to send them. I say poorer because it is essentially a one-sided checkerplay position.

If I get time I could also try this with a larger search space for the pruning net but I wanted to have identical settings for both nets initially.

I rolled this out with 0.14 2-ply and the wins were 75.1% with gammon losses at least 4% lower, and the standard error was 0.001 wins, and 0.006 cubeful (one-third the error of the 0.15 version) after only 600+ trials. I was unable to save that 2-ply rollout result, so I am repeating the 0.14 rollout today and could forward the .sgf if you like.

Here is a discussion thread at GOL about this position with several additional rollout results including 0-ply GNU and Snowie 4.1.


My general observation after several rollouts with 0.15 is that the error rates for cubeful equities are taking several times more trials to converge than the 0.14 net.

This is a general observation as an experienced user, not a claim as a result of any scientific study. While we can all enjoy the immediate benefits of match analysis that is twice as fast, it could just be that it will take us some time to rediscover the ideal rollout settings with the 0.15 version.


On Sat, 16 Oct 2004 12:42:24 +1300
 Joseph Heled <address@hidden> wrote:
... Please post a reproducible case, with a smaller n as possible, full setting, and seed ...


Attachment: 5 prime redouble rollout_prune_2ply.txt
Description: Text document

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