Under the Stones Problem 4 / Solution

[Diagram]

Ko

This is a ko. Assuming W6 is a ko threat and black answers with B7 then black cannot kill by playing under the stones as shown in the next two diagrams.

[Diagram]

Continuation 1

[Diagram]

Continuation 2

And white is alive because of his second eye at a.

[Diagram]

White's resistance is not enough

W2 is not the best move. B7 under BC.


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