GokyoShumyoSection4Problem8/Solution

Karl Knechtel:

[Diagram]

White to win the capturing race

W1 threatens to make life in the corner, while creating approaches to the existing liberties. If Black threatens the connect-and-die at 3, White simply blocks, and B4 is a necessary approach move, allowing White to win the semeai (which then stands at 2 liberties each).

[Diagram]

Variation

If Black plays at B2 directly here, White should answer at 3. Black is captured. W3 leaves smaller ko threats than any other way to capture. Should Black play a ko threat that White ignores, the damage is smaller.

[Diagram]

Failure

W1 looks like the right way to exploit the shape, by analogy with problem 4, but after B2, the best White can do is to set up a ko.


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