GokyoShumyoSection5Problem20/Solution

[Diagram]

Black start

Black must start by cutting. W4 avoids ko in the corners (see further down), but is a mistake

[Diagram]

(W10 at B7)

White could play W10 at B11 to avoid further disaster, but then black captures, saving his stones. After white defends, B11 prevents an eye in the corner and white is in trouble.

[Diagram]

Oiotoshi

White needs to fill four times, but black only needs two moves to approach, so white cannot avoid the oiotoshi after B15.

[Diagram]

White can get ko

White can get ko, however, by playing W4 like this and throwing in with W6.


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