GokyoShumyoSection4Problem11/Solution

[Diagram]

Exploiting the corner

White can't approach at a.

[Diagram]

White's try fails

Note that B5 at a allows white to make ko by playing at b; and B5 at b loses to White c.


For the Addendum:

[Diagram]

Not a clean problem

The earlier problem lacked one stone each and White gets a desperate approach ko (probably unintended by the composer).


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