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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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