Re: [gnugo-devel] owl:6

[Gunnar Farneback]

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