Re: [gnugo-devel] owl:6

[SP LEE]

> SP Lee wrote:
> > Then I think we can omit this test case safely. There is no aji to
> > find at all on the surrounding.
>
> Why should we do that? This seems like a great test case, although
> difficult, regardless whether there actually exists a defense or not.
>
> > Still I found this is not an easy problem, white can play A5 after
> > black B6.
>
> Now that move looks like something. Also it isn't in All About Life
> and Death, so I can't look it up.
>
> > Then black seems not to be able to kill white cleanly. For
> > example, black B2, white A2. Or B:A2, W:A3, B:B3, W:B4. I could miss
> > some variations.
>
> I agree. I can't find anything better than ko now.
>
> > Anyway I think gnugo doesn't have to know all the
> > variations.
>
> It suffices if it knows a few relevant ones. :-)
>
> Graham wrote:
> > I think just extending then tactic on p98 ALD Gunnar cited, is
> > sufficient.
> >
> > eg (B 1st):
> > C1,B1,A2,?B3,C4
>
> No, it doesn't work. White can switch B3 to A3 and get a ko in this
> position.
>
> /Gunnar
>
>

I think Graham meant black to play C1 directly without black B6. Then I
can't see any chance of white to live.

SP Lee