Igo Hatsuyo-ron Problem 141 / Attempts

[Diagram]

White to play



Karl Knechtel: This general idea, I think. But the semeai is a bit complicated...

[Diagram]

Continuation?



Actually, I guess the marked White stone should go at a instead... anyway, if Black doesn't play B1, it seems like either it will reduce to the same semeai, or else Black fights a rather unfavourable multi-step ko.


[Diagram]

Attempt

[Diagram]

Attempt

[Diagram]

Attempt (W5 at W3, B6 at white+circle)


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