XuanxuanQijingProblem53/Solution

[Diagram]

Main line (1)

B1 to W8 sequence is natural. Next sequence may be the real problem.

[Diagram]

Main line (2)

B9, B11, and B13 sequence is critical. White cannot move to a because of shortage of liberties.

[Diagram]

wrong order - Failure

For B9 first, White can live.

[Diagram]

Easy to mistake

black+circle instead of a is a mistake, too. White can catch B9 by oiotoshi.

[Diagram]

Attempt

For B1, white can live at least by ko.


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