Xuanxuan Qijing Problem 78 / Solution

[Diagram]

Hashimoto solution (B11 at b)

B7 threatens to kill White by a next. Then B9 and B11! secures another eye in the center.

[Diagram]

Ko

W4 here leads to ko. It is very risky for White because Black takes first and resolving the ko further threatens to kill White. Black has local ko threats at a, b and c. (Hashimoto's first book on the collection was published in 1935 and local ko threats should be considered as part of the solution in those days. So this ko line was not a defect of his solution.)

[Diagram]

Variation

W2 descent is met by B3. After B5, a and b are miai.

[Diagram]

Failure: under the stones

After W2 descent, B3 is now a decisive mistake because B11 capture at a is met by W12 at white+circle.


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