Gokyo Shumyo, Section 1, Problem 42 / Solution

[Diagram]

White to live

W1 is the vital point here, making eyes at the marked points. If Black captures two stones ...

[Diagram]

White to live

... White recaptures and her eyes are still real ones.

[Diagram]

Failure

It is tempting to protect two stones, but Black will block at a or b. White can at most extend to six stones on the second line, and as we know "six die but eight live".


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