GokyoShumyoSection4Problem48/Solution

[Diagram]

the key move

White can reply at any of a, b or c, but they all fail:

[Diagram]

variation 1

B3 is important to avoid ko. B3 at B5 is met by W4 at B3 throw-in.

[Diagram]

variation 2

[Diagram]

variation 3


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