Xuanxuan Qijing Problem 12 / Solution

[Diagram]

The three black stones needs another liberty.

Both a and b works, if all we care is to capture the corner white stones.

However, taken points and ko threats into account, b is better.

[Diagram]

B3 is a tesuji to get one more liberty in sente.

See cut to gain a liberty for more information.


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