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


From: Øystein Johansen
Subject: Re: [Bug-gnubg] Question: Interpreting Evaluation Results
Date: Mon, 02 Mar 2009 21:17:39 +0100
User-agent: Thunderbird 2.0.0.19 (Windows/20081209)

Bob Hart 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 value.
> 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 . . .

GNU Backgammon sorts the moves evaluated at the highest plies first.

Rollout > 3-ply > 2-ply > 1-ply > 0-ply cubeful > 0-ply cubeless

24/21 13/9 is not best in your situation, according to the list, 24/20
13/10 is the best move since this has the highest equity.

-Øystein

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