IgoHatsuyoRonProblem90/Attempts

This is not the kind of problem you can solve on the back of a beer mat. After W2, Black has the problem of whether or not to directly block the diamond life in the corner. After W9 I imagine B10 is forced, which lets White obtain A, a move which is sente against the corner. Of course, B2 and B4 are not forced.

[Diagram]

First idea



So I come to next to this position. So far I assumed B2 and B4 are interchangeable. Here Black needs to consider b or a. Given the outside, I assumed that Black can clearly play the former with ko, but then he must logically prefer the latter if it allows him the chance to kill..

[Diagram]

Branch


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