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Re: [gnugo-devel] Owl (performance) tuning

From: bump
Subject: Re: [gnugo-devel] Owl (performance) tuning
Date: Mon, 23 Dec 2002 11:43:45 -0800

> owl:46          FAIL
> Well, I tried my best but I couldn't find the refutation of E1. If a dan
> player could tell me, I would try again to correct the problem.

You mean that GNU finds a defense but it's at E1 instead of one
of the listed moves?

E1 looks like a valid defense and could be added to the accepted

> viking:1        FAIL
> Here, I think that the PASS is a lucky one, based on the uncertainty of an
> attack on P17. IMO, whether O15 has a chance to kill or not shouldn't matter,
> specially since I believe that it actually doesn't kill, if the defender
> doesn't tenuki. Also, E4 looks a bit overvalued to me.
> But it's a very serious problem, since O15 is almost mandatory in such
> positions. Unfortunately, JH431 doesn't match because of the additional
> stone at Q14. And I guess, we don't have the right tools to generate
> following from sgf files.

The automatically generated patterns are always rectangular. So
should add a pattern such as the one you propose to fuseki.db.

I wouldn't play E4 but C3 instead, locally.

> strategy:55     FAIL
> If we observe that CVS also plays C14 if the owl node limit is increased
> to 1200, then we must conclude that this FAIL is accidental. The performance
> gain just makes the problem visible.

I think you mean strategy2:55. C14 looks possibly playable but C12 is a much
clearer answer. But at least it doesn't tenuki.


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