Re: [gnugo-devel] Surprisingly good, yet missing last chance

[SP LEE]

Thanks for your reply. I agree that finding the best solution is too 
complicated. However, do you mean that it's also complicated for GNUGO to 
treat conditional alive as indeed conditional and not unconditional? If 
GNUGO can see that it captures a group of opponent stones in a semeai and 
believes it wins the game, it can, I think, just fill the liberties to get 
the opponent stones out of the board because it got to do it anyway.

SP Lee

> From: Evan Berggren Daniel <address@hidden>
> Reply-To: GNU Go development <address@hidden>
> To: GNU Go development <address@hidden>
> Subject: Re: [gnugo-devel] Surprisingly good, yet missing last chance
> Date: Sat, 29 Mar 2003 14:28:34 -0500 (EST)
>
> This is actually a very complicated position for Gnu Go, I believe.  Part
> of the problem is that there are actually three groups involved -- J13,
> E19, and H19.  After move 108 (b H19), Gnu Go believes that E19 is
> unconditionally dead, and that H19 and J13 are unconditionally alive.  I
> think the best result for both sides is actually for white to begin
> filling the liberties on J13 (L19 at F10, for example); unless I'm
> misreading, J13 dies, allowing E19 to escape, but H19 can get two eyes in
> the process by catching the J17 stone.  Of course, I could be misreading
> things.  Clearly, L15 and K17 are bad moves regardless.  If my reading of
> the situation is correct, then I think the position may be too complex for
> Gnu Go to understand without some serious revisions.
>
> It's a very intersting position; thanks for sending it.
>
> Evan Daniel
>
> On Sat, 29 Mar 2003, SP LEE wrote:
>
> > Hi all,
> >
> > I played a game again with GNUGO. At near the end, the GNUGO 
> surprisingly
> > let a group of its stones alive, while my group of stones die (of course 
> due
> > to my mistake). However, it seemed not having the knowledge of eliminate
> > liberties of the opponent group and missed its last chance.
> >
> > I think this is rather a problem of calculation of liberties than
> > complicated reasoning. Can you guys find out why this happened?
> >
> > SP Lee
> >
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