RE: [computer-go] double threats

[David Fotland <fotland@xxxxxxxxxxxxxxx>]

Many Faces marks them both as unsettled, but a special kind of 
unsettled.  The tactical search result can be

Stable - seki, 2 eyes, or 5 liberties even if opponent moves first
unsettled - captured or lives depending on who moves first
ko - capture depends on a ko
possible unsettled - two groups are involved in fight and the opponent 
decides which one lives
dead - captured even if this side moves first

When there is a possible unsettled group, the full board lookahead resolves 
the problem as part of
the quiescence search.

David

At 10:45 AM 1/7/2004 -0700, you wrote:
> > Let's say that two blocks are threatened and the defender may choose
> > which block he wants to give up. Then the block tactician might treat
> > the two blocks as "half-DEAD" or it might treat the bigger (or
> > "more important") block as ALIVE and the smaller one as DEAD.
> > ...
> > Jens
>
> This is exactly what SmartGo does. If it determines that one block is 
> important and the other one is not, then it declares the important one as 
> unsettled and the other one as alive, otherwise it declares both of them 
> as unsettled. Currently, it deems a block to be important if it's either:
> - 3 stones or more, or
> - surrounded by multiple chains (a likely cutting stone), or
> - adjacent to an unsettled group.
>
> This seems to work reasonably well in practice, but I'd certainly be 
> interested in better solutions.
>
> Anders Kierulf
> <http://www.smartgo.com>www.smartgo.com
>
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