RE: [computer-go] Designing faster, better influence functions

["Mark Boon" <tesuji@xxxxxxxxx>]

I also don't think this is a fair critique, calculating influence is
something else completely from determining what is dead or alive. Why does
ManyFaces consider the lower-right dead? Probably your 4-liberty tactician
found out. What if it had one or two liberties more? Why is the white group
on the left not considered dead?

Goliath also 'removes' dead stones if the tactician finds out they can't
escape, but it's limited to 2-liberty groups.

It's a bit of a chicken-and-egg problem. Before you have a good influence
you first need to know what's dead or alive. How to know what's dead? You
need to look at eye-space (among other things), which is derived from
influence...

In Goliath I solved this by first computing the influence. From that I
derive groups, territory, eye-space and other stuff that basically
determines the strength of groups. Then I try to determine which
groups are dead by looking at their (relative to neighbours) strength and
eye-space. When considered dead, a group is 'removed' and the influence is
calculated again for the score.

> -----Original Message-----
> From: computer-go-bounces@xxxxxxxxxxxxxxxxx
> [mailto:computer-go-bounces@xxxxxxxxxxxxxxxxx]On Behalf Of Frank de Groot
> Sent: Saturday, October 30, 2004 20:50
> To: computer-go
> Subject: Re: [computer-go] Designing faster, better influence functions
>
>
> From: "David Fotland" <fotland@xxxxxxxxxxxxxxxxx>
>
> >It doesn't look reasonable to me, since it gives territory to
> dead groups.
>
> Bruno Bouzy's 5/21 function also does.
> These influence functions are based on the fact that dead stones
> are removed
> first.
>
> Because Bouzy in his thesis did not remove dead stones and I wanted to use
> the same position for comparison, I also did not remove dead stones.
>
>
>
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