Re: [computer-go] citation

[Martin Girard <arister@xxxxxxxxxxxx>]

On Jul 14, 2004, at 19:37, Darren Cook wrote:

> > >  Given a position on an arbitrarily-sized Go board,
> > >  and a white group with 2 liberties, can Black keep
> > >  putting white
> > >  in atari---that is, reduce white to 1
> > >  liberty---until capture?
> > I agree that this definition is easy to understand.
> > However, this definition for ladder is simply WRONG
> > because it cover just some aspect of ladder formation
> > and many many other Go formations.
> Can you give an example of a board position where the above definition 
> applies and it is not a ladder problem?
Let white play at (1, 1) and black at (2, 1). This obviously doesn't 
look like a ladder, or stairs, or anything like that. What's more, 
unlike the casual ladder, black will want to pursue even if the capture 
fails since he builds a wall for free. ;)

Some variants of this involve pipes and intersections and can therefore 
be transposed to certain path problems where white has to decide where 
to block. Breaking out of these schemes can also involve the capture of 
some of white's stones, and therefore has more in common with capture 
problems.

--Martin

> Darren
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