IgoHatsuyoRonProblem15/Solution

[Diagram]

First, White tries to live in the corner. If Black resists, White cuts off the Black group. B10 is forced.

[Diagram]

W11!! is the decisive double threat. When B12 prevents the ladder from White a, White kills Black by W13 and W15! (B14 at B16 is met by W15 at B14).


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