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RE: [Bug-gnubg] Question: Interpreting Evaluation Results

From: Bob Hart
Subject: RE: [Bug-gnubg] Question: Interpreting Evaluation Results
Date: Mon, 2 Mar 2009 15:29:42 -0500


        Thanks. My goal is to have the software consistently show the best
move of the top three choices (or so) at the top of the list. This is so I
don't have to look at thousands of results and carefully read the entire
list for each position, thinking about plies and sort order. I am trying to
understand how to do this before I spend a significant amount of time
setting up multiple machines to have gnubg evaluate a large number of

        So, can I force the 5-ply evaluation to consider more than one move
using the "Move Limit" setting in Settings/Analysis? Or should I do this
with an even number of plies to get around the odd-ply/even-ply problem you
mention? Or . . . ?

        Thanks for any insight.


-----Original Message-----
From: Christian Anthon [mailto:address@hidden 
Sent: Monday, March 02, 2009 3:16 PM
To: Bob Hart
Cc: address@hidden
Subject: Re: [Bug-gnubg] Question: Interpreting Evaluation Results

It is generally not advisable to compare evaluations using different
parameters. This is particularly true for gnubg which has an
odd-ply/even-ply problem. In short, you should evaluate all the moves
you wish to compare at the same ply.


On Mon, Mar 2, 2009 at 8:29 PM, Bob Hart <address@hidden> wrote:
> Hi-
>  I would like to understand how to interpret evaluation results presented
> with different plies and out-of-order equities.
>  In reviewing the results below, I would ideally want to conclude "at a
> glance" that gnubg evaluates 24/21 13/9 as the best play, because it is at
> the top of the list. It appears, however, that the moves are not sorted
> primarily in equity value, but rather by ply-value and then by equity
> So is gnubg saying that the best move is the first one, 24/21 13/9, or is
> the best move the third one, 24/20 13/10, which has the best equity?
> 1 Cubeful 5-ply -0.199          24/21 13/9
> 2 Cubeful 4-ply -0.163  +0.036  13/10 13/9
> 3 Cubeful 2-ply -0.155  +0.044  24/20 13/10
> 4 Cubeful 2-ply -0.182  +0.017  24/21 24/20
> 5 Cubeful 2-ply -0.217  -0.018  13/9  8/5
> . . . Many more moves, all with worse equity . . .
>  Thanks for any insight.
> -Bob
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