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Re: [Bug-gnubg] Evaluation question

From: Michael Petch
Subject: Re: [Bug-gnubg] Evaluation question
Date: Wed, 19 Jun 2013 22:29:13 -0600
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130509 Thunderbird/17.0.6

On 19/06/2013 5:31 PM, address@hidden wrote:
> I've found Gnu evaluates desperation situations very poorly.
> Specifically, if an opponent is rolling off and you are racing to get
> one piece off to avoid a gammon, Gnu mis-evaluates moves.
> My moves of 63:13/10, 13/7, 31:8/5 7/6 and 65 10/4 8/3 were rated very
> bad, bad, and doubtful.
> How can this be?
> My sole goal at this point is to avoid a gammon (which I managed to
> do, btw). Any move I made other than the ones I did would have
> resulted in a gammon... (i got one piece off).
> Any thoughts?

What version of GNUBG are you using. Help Menu/About/Buildinfo the line
at the top should show the build number. What platform OS are you using
(Windows9, Win8, OSX, Ubuntu etc? What analysis level are you using
(Settings Menu/Analysis/Analysis Level option is what I'd like to know)?
Were you using tutor mode while playing and it told you these errors. If
this was in Tutor mode, what tutor level do you use -  you can see that
here: Settings Menu/Analysis/Eval Hint/Tutor Level). If you saved the
analysed match as an SGF file I'd be able to look at it here to see the
actual evaluations.

The reason I ask these questions is that my copy of GNUBG (0.90-mingw
20121023) has an analysis shows that the only one GNUBG disagreed a bit
with was the 63 and it didn't even rate as doubtful. It had about a
0.030 error. The rest of the moves the bot agreed with your plays.


Michael Petch
GNU Backgammon Maintainer / Developer
OpenPGP FingerPrint=D81C 6A0D 987E 7DA5 3219 6715 466A 2ACE 5CAE 3304

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