Xuanxuan Qijing Problem 247 / Solution

[Diagram]

Original Solution

This is the original solution, killing unconditionally. B1 and B3 can be switched. However W8 at a lives. B5 and B7 should be switched.

[Diagram]

Improved solution: ko

Ko is the best result for both sides.

[Diagram]

Failure

B3 first is a mistake. White is alive after W8.


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