XuanxuanQijingProblem200/Solution

[Diagram]

Solution B11 at a

Order of play is important in this problem.

[Diagram]

Variation

[Diagram]

Wrong Order

The reverse order is met by W4 turn and allows ko. (B5 at a is met by W6 at B5.) Compare with the above diagram; Black could connect underneath if not for the exchange of B1 and W2.

[Diagram]

Oversight by Go

B1 and B3 without the other hane is met by W4 (overlooked by Go Seigen), leading to ko again.


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