XuanxuanQijingProblem158/Solution

[Diagram]

Black to play

B3! is the point. W6 is the last effort to get more eyespace.

[Diagram]

a above

W10 capture at W6, B11 at B7, W12 at W8....this four-move repeating shape is called eternal life.

[Diagram]

b above: ko

[Diagram]

Variation

White can't capture at W4.


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