Xuanxuan Qijing Problem 51 / Solution



Solution

[Diagram]

Solution

[Diagram]

Black's resistance

B2 is necessary to secure enough eye space.

After W3 the space at 'x' is rendered useless, because of the atari at 'a'.

[Diagram]

So the shape in the previous diagram is practically the same as this one; the group is dead.

If black tries to play 'a', white makes an eye in the corner with 'b' and wins the capturing race.

Failure

[Diagram]

W1 results in ko, which is not the best here.

On the other hand, if black has outside liberties, this the best white can do.

[Diagram]

W1 first is similar to the previous diagram.

[Diagram]

W1 or at 'a'

[Diagram]

For other W1, B2 makes life.


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