XuanxuanQijingProblem150/Solution

[Diagram]

Original Solution

[Diagram]

Original Solution (continued)

B3 threatens a ladder from Black a. If W4 escapes, the lower group is killed. However...

[Diagram]

Refutation

W1!! was found in Japan (attributed to Dosaku). This prevents both Black threats.

[Diagram]

Black's best - ko

Black can play hane at B2 and make ko.

[Diagram]

Black's best - ko (continued)


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