Practical Endgame Test 9

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[Diagram]

B moves, 11 komi

Reuven: What's the optimal outcome? Having solved it, what's the minimal komi for W not to lose?

[Diagram]

attempt

hhw: Looks like jigo with the original 11 komi. If Black tries B3 at a, it seems like White has to too many ko threats at b.


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