Xuanxuan Qijing Problem 3 / Solution

The solution is: White is alive -- so both sides should tenuki.

[Diagram]

Black tries to do something (1)

If B1, W2 is a tesuji. White answers B3 with W4.

[Diagram]

Black tries to do something (2)

After the previous diagram, 'a' and 'b' are miai. If Black A, then White B; and if Black B, then White A. In both cases White will have enough liberties to capture the internal Black group.

[Diagram]

Black tries to do something (3)

Alternatively Black can hane with B1. One can check that White is alive after W2.

[Diagram]

Black tries to do something (1)

If Black tries to take a more symmetric point, then W2 is good enough. Soon, A and B become miai for White.


Notably, there exists a similar common corner shape as shown below.

[Diagram]

Black to kill.

[Diagram]

The solution

After 1~9, 'a' and 'b' are miai to almost fill white with a big eye.

[Diagram]

Wrong attack

Black 1 is a wrong attack leading to this problem. White is alive after this sequence.


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