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Re: [gnugo-devel] influence patch

From: Gunnar Farneback
Subject: Re: [gnugo-devel] influence patch
Date: Tue, 24 Sep 2002 18:36:01 +0200
User-agent: EMH/1.14.1 SEMI/1.14.3 (Ushinoya) FLIM/1.14.2 (Yagi-Nishiguchi) APEL/10.3 Emacs/20.7 (sparc-sun-solaris2.7) (with unibyte mode)

I wrote:
> It seems we are currently systematically undervaluing moves actually
> taking stones off the board. This includes, but is not limited to, ko
> captures. More precisely a captured stone counts for two points (in
> most cases) when evaluating territory, but when the move takes stones
> off the board, only one point is counted.
> The appended patch corrects this. I haven't run the regressions yet.

The regression delta is 3 passes (strategy:10, endgame:501,
trevorc:560) and 3 failures (trevorb:270, trevord:340, nngs3:510). The
failed test cases are all acceptable.

trevorb:270  Two moves misvalued, one corrected by the patch.
trevord:340  Territorial valuation of F8 improved, inappropriate shape values
             (empty triangle) cause the failure.
nngs3:510    Completely bogus valuation, inappropriate shape value (ponnuki).

> This one-liner solves reading:172 with only a marginal increase in the
> node count for reading.tst. I'd say it's well worth it.
> - break_chain2_moves() revised

3 passes (reading:172, nngs:500,510) and 1 failure (nicklas2:701). The
failed test case is acceptable.

I have added both patches to CVS.


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