IgoHatsuyoRonProblem86/Solution

[Diagram]

White to play

B4 is necessary for both defense and attack. W9 at W5, B10 recapture at B8. White has connected in sente.

[Diagram]

continued

W5 makes ko. If Black resists with B6...

[Diagram]

escape

W5 becomes sente and White escapes.


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