[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [gnugo-devel] Patch: Strategic effect for strategic attacks and defe
From: |
Inge Wallin |
Subject: |
Re: [gnugo-devel] Patch: Strategic effect for strategic attacks and defenses |
Date: |
Mon, 21 Oct 2002 10:34:36 +0200 (MEST) |
Gunnar wrote:
> Inge wrote:
> > trevorb:390 FAILs for other reason
> > The chosen move, F7, has a valuation of 6 points for
> > "defends against combination attack on several worms",
> > which a) does only capture in ko and b) the correct
> > move also protects against.
> >
> > The problem here is that atari-atari only generates
> > one defense point.
>
> Wrong, atari_atari (or strictly speaking combinations()) generates up
> to four defense points. In this particular case F7, G7, and G6 (the
> correct move) are found.
This has to be new. I didn't check the code, but took the "fact" from
my memory. That's what you get when you are away for 6 months. :-)
> But it's correct that atari_atari sometimes misses the best defense
> when there are lots of candidates. This patch solves the problem by
> forcing atari_atari to generate nearly all possible defense
> moves.
>
> This is done by marking all potential defense moves during the
> atari_atari reading, i.e. moves in the attack sequence, liberties of
> moves in the attack sequence, and moves defending some threatened
> string in the sequence. To determine which of them are really
> effective, we play the move and see whether the combination attack has
> gone away.
>
> The regression delta is good, 12 passes, no failures.
Yay! Way to go. Nice to see that the work I put into the tests paid
off.
-Inge
- Re: [gnugo-devel] Patch: Strategic effect for strategic attacks and defenses, (continued)
Re: [gnugo-devel] Patch: Strategic effect for strategic attacks and defenses, Arend Bayer, 2002/10/14
Re: [gnugo-devel] Patch: Strategic effect for strategic attacks and defenses, Gunnar Farneback, 2002/10/19
- Re: [gnugo-devel] Patch: Strategic effect for strategic attacks and defenses,
Inge Wallin <=
[gnugo-devel] Patch: Strategic effect for strategic attacks and defenses, Teun Burgers, 2002/10/19