Shikatsu Myoki Tsumego Series 76 / Solution

[Diagram]

Original Solution

Note: In Shusai's days, local ko threats must be considered in solving a composed problem. Black has none after W7.

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Continued

Live in double ko.

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Reference

In practice, Black may use an outside ko threat and capture the ko at B8. After W11, it's still a double ko.

[Diagram]

Reference 2

B10 can't prevent the double ko or escape to the left. (Of course, White uses these moves as ko threats to capture the ko in the right.)


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