Sounds like you are describing Benson safety.  It's quite fast.  The
trick is correctly implementing it.


On 11/6/07, steve uurtamo <[EMAIL PROTECTED]> wrote:
> i wonder what is known about the set of unconditionally
> dead and unconditionally living groups.  there must be
> something like a small and extremely fast mechanism for
> this.  what is everyone using?  i mean a mechanism that
> is independent of any fancy data structure that you would
> have incrementally been maintaining.
>
> the idea is: identify at least one stone from every unconditionally
> living and every unconditionally dead group on the board, and
> report them as dead or alive.
>
> how fast can this be done, if you're passed a 19x19 array
> of integers (white,black, empty)?
>
> to be clear, i mean living groups where there are no ko threats
> whatsoever, and dead groups where there is no threat of seki (which i
> suppose is a pretty big ko threat).
>
> s.
>
> ----- Original Message ----
> From: Jeff Nowakowski <[EMAIL PROTECTED]>
> To: computer-go <computer-go@computer-go.org>
> Sent: Tuesday, November 6, 2007 5:28:29 PM
> Subject: Re: [computer-go] use for Monte Carlo on 19X19?
>
>
> On Tue, 2007-11-06 at 16:55 -0500, Don Dailey wrote:
> > Hi Jeff,
> >
> > Yes, I agree with your points.    Well behaved on CGOS means that
>  your
> > bot will resign as soon as it knows it's losing.
>
> I think when a bot should resign is a matter of personal preference.  I
> myself prefer to see games played out if it's somewhat close or very
> near the end.  If there's a handful of moves left what's the point of
> resigning?
>
> > But against humans it should technically be the same, but isn't.
>   When
> > playing against humans a bot needs to be able to mark dead groups.
>
> I have the same feelings whether it's a bot vs bot game or bot vs
>  human.
> As for marking dead stones, obviously a bot needs to be able to against
> humans, and I never suggested otherwise.  My only point is that you
> don't need territory scoring rules for this.
>
> -Jeff
>
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