Re: [gnugo-devel] New owl attack pattern

[SP LEE]

> On Tue, 9 Sep 2003, Arend Bayer wrote:
>
> > Also, below is a suggestion to make the constraint more precise.
> >
> > > +Pattern A722
> > > +#spl added 3.5.2
> > > +
> > > +XXO?
> > > +.*XO   destroy eye, valid both on center and edge
> > > +XX.O
> > > +
> > > +:8,s,value(45)
> > > +
> > > +XXO?
> > > +.*XO
> > > +AA.O
> > > +
> > > +;lib(A)==3
> >
> > How about:
> >
> > BBO?
> > c*XO
> > AAdO
> >
> > ; (lib(A) == 3 || lib(BB) == 2) && proper_eye(c)
>
> you might even make that
>
> ; (lib(A) == 3 || lib(B) == 2 || oplay_attack(*,d,B) && proper_eye(c)
>
> since it seems entirely possible that shortening the liberty could
change
> the tactical status if there is a tactical semeai involved.  I don't
know
> if it would be worth the time to check or not though.
>
> Evan
>

I don't quite understand this constraint. Can you give an example? That
is, lib (A) > 3 AND lib (B) > 2 and * is still a good move. Thanks.

SP Lee