GokyoShumyoSection4Problem30/Solution

[Diagram]

B1 normally increases one liberty

After B1, White a is met by b, c by d, and e also by d. No hope?

[Diagram]

Big Ko

W2 is the beautiful counter. Ko is the answer. (In practice, White may well play at a and d above, sacrificing the center and living the corner in sente.)


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