XuanxuanQijingProblem174/Solution

[Diagram]

White to play

W5! aims at the whole group. W9 prevents seki shape.

[Diagram]

Continued: ko

B14 at white+circle.

[Diagram]

Variation 1: White failure

W5 cut allows a small life. (In practice, this line may be preferable.)

[Diagram]

Variation 2: Black failure


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