XuanxuanQijingProblem237/Solution

Revised version

[Diagram]

Solution

[Diagram]

Continued

W11 at white+circle.

[Diagram]

Black's stubborn resistance

B6! leads to two-move approach ko.


Original version

[Diagram]

Original Solution

This line is shown. W2 is a weak defense.

[Diagram]

Ko

This ko is the best for both sides. Because...

[Diagram]

dead

W4 here dies unconditionally (W8 at a is met by Black b).


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