Re: [computer-go] double threats

[Darren Cook <darren@xxxxxxxxx>]

>> > 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.

Interesting thread - I'd not found a good solution to this issue, so have 
mostly ignored it. Assuming the defender always defends the bigger chain is 
an interesting idea.

> 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
Do you pass the 5th state up through the tactical search tree? Or do you 
only treat it as special at the root node?

If you pass it up through the tree, how do you order it to decide which 
information to pass up if you have one move leads to unsettled, and one move 
leads to special unsettled?

Darren

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