IgoHatsuyoRonProblem126/Solution

[Diagram]

Black to play and connect underneath

After some preparations, B9 connects by ko. W10 can be at a, b or c.

[Diagram]

a) ko connection

c above leads to the same shape.

[Diagram]

b) Throw-in ko

W3 is necessary sooner or later. B4 starts ko.


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