Re: [gnugo-devel] influence and territory values

[David G Doshay]

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


Cheers,
David