RE: [computer-go] Is seki problem solved ?

["Mark Boon" <tesuji@xxxxxxxxx>]

Count the points, before and after. It does lose a point.

> -----Original Message-----
> From: computer-go-bounces@xxxxxxxxxxxxxxxxx
> [mailto:computer-go-bounces@xxxxxxxxxxxxxxxxx]On Behalf Of Nick Wedd
> Sent: Wednesday, November 03, 2004 15:08
> To: computer-go
> Subject: Re: [computer-go] Is seki problem solved ?
> 
> 
> In message <DIELJMJIOOKDJHHGCFAHMENKCFAA.tesuji@xxxxxxxxxxxxxxxxx>, Mark Boon 
> <tesuji@xxxxxxxxxxxxxxxxx> writes
> >I don't think your example is in the same class. It loses a point and
> >requires a ko to make up for it.
> 
> It doesn't lose a point, because Black answers it.  But I agree that the 
> other examples are more interesting.
> 
> >Other examples on the page you mention are better.
> >
> >> -----Original Message-----
> >> From: computer-go-bounces@xxxxxxxxxxxxxxxxx
> >> [mailto:computer-go-bounces@xxxxxxxxxxxxxxxxx]On Behalf Of Nick Wedd
> >> Sent: Wednesday, November 03, 2004 14:07
> >> To: computer-go
> >> Subject: Re: [computer-go] Is seki problem solved ?
> >>
> >>
> >> In message <DIELJMJIOOKDJHHGCFAHMENICFAA.tesuji@xxxxxxxxxxxxxxxxx>, Mark Boon
> >> <tesuji@xxxxxxxxxxxxxxxxx> writes
> >> >|OOOOXXXXX
> >> >|XXXXOOOOX
> >> >|OOXbOXXOX
> >> >|OaX.OX.OX
> >> >----------
> >> >
> >> >O can win by playing suicide at 'a'. X can prevent it by playing
> >> at 'b', but
> >> >there exists a more complicated example based on the principle
> >> above where X
> >> >can't prevent it even.
> >> >
> >> >This was found by Guus Rol a long time ago in his quest 'Is
> >> there life after
> >> >death?' and published in the Dutch Go journal, but I can't 
> remember the
> >> >exact position.
> >>
> >> There's a bunch of examples where suicide is a good move at
> >> http://www.goban.demon.co.uk/go/bestiary/rule_challenge.html
> >>
> >> These do not include the obvious
> >>
> >>
> >>   O . O # O . .    Upper left corner of board
> >>   # # # # O . .    O, to play, needs a ko threat
> >>   . . . . O . .
> >>   O O O O O . .
> >>   . . . . . . .
> 
> Nick
> -- 
> Nick Wedd    nick@xxxxxxxxxxxxxxxxx
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