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Re: [gnugo-devel] influence and territory values

From: David G Doshay
Subject: Re: [gnugo-devel] influence and territory values
Date: Sat, 13 May 2006 14:02:04 -0700

On 13, May 2006, at 1:33 PM, Gunnar Farnebäck wrote:

David wrote:
The opponent's first move was F6, a 4-4 point on a 9x9 board.

In looking at the SlugGo global lookahead options, I see the expected
behavior in 2 sequences that are rotations of each other, and the
same influence and territory values are calculated. However two other
options result in exactly the same board, but give different
influence and territory values:

Following from F6, option I is us G4, them C6, us D3, and option L is
us D3, them C6, us G4.

For option I: InfW=-7.00, TerrW=-3.00, InfB=-29.00, TerrB=-3.00
For option L: InfW=-11.00, TerrW=-3.00, InfB=-31.00, TerrB=-3.00

Why would the same board evaluate differently?

No idea. How are InfW and InfB computed?

These are just short names for:

    influence4black = influence_score(INITIAL_INFLUENCE( BLACK ));
territory4black = influence_evaluate_position( BLACK, NULL, &status );
    influence4white = influence_score(INITIAL_INFLUENCE( WHITE ));
territory4white = influence_evaluate_position( WHITE, NULL, &status );

calculated directly from the functions in engine/influence.c


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