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Practical Endgame Test Four Solution
   

Since unkx80 posted a correct solution almost before my mouse button cooled off from posting the problem, I have taken the liberty of moving it here from the analysis page. Compared to the book there are a few differences in the order of the ko threats but they are all correct. --DaveSigaty

[Diagram]
Diag.: 4, 10 at marked stone; 7 at 1

Seems to me that black and white have 6 ko threats each.

Assuming black takes the ko first...

(I think that W playing 8 instead of just continuing with 9 is one of the nice ideas in the problem. I know that I many times playing ko threats rather superficially without thinking of all alternatives. --DaveSigaty)


[Diagram]
Diag.: 6 at marked stone; 9 at 3

[Diagram]
Diag.: 5 at marked black stone; 6 at marked white stone

[Diagram]
Diag.: 5 at marked black stone; 7 at marked white stone; 8 at 2

(I think that finding B 3 is the other really nice point of this problem. For me it is natural to play B at 9 in such shapes automatically when looking for ko threats. --DaveSigaty)


[Diagram]
Diag.:

... looks like black wins. Any better answers, comments or objections?

-- unkx80



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