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Re: [gnugo-devel] attack1() patch

From: Evan Berggren Daniel
Subject: Re: [gnugo-devel] attack1() patch
Date: Sat, 23 Nov 2002 01:05:58 -0500 (EST)

On Fri, 22 Nov 2002, Evan Berggren Daniel wrote:

> This patch solves reading:55.  In the testcase, the defender can make a
> group with one eye and one liberty in ko.  The reading code does not
> understand that the defender cannot win the ko no matter what.  This patch
> makes attack1() count such cases as wins by checking whether the defender,
> given infinite moves, could actually defend.  (Defender needs more than
> one chance for cases like reading:132 where he must win the ko more than
> once, but can win eventually.)  Of course, this has a small performance
> penalty (reading nodes in reading.tst from 97435 to 97799).
> I am running a full regression suite now, and will post results if more
> than reading:55 changes.

So far one fail in ld_owl:182 (a tripod group ko problem).  It seems
likely to be real.  I'll see if I can get something better worked
together, but the patch is probably a bad idea as it stands.


Evan Daniel

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