Retrograde Analysis Problem 4 / Solution

[Diagram]

It could be that through a ko fight, 7 White stones and 6 Black stones were made prisoners in the [circled point] area.

[Diagram]

Then when Black wins the ko, B1 connects, allowing another 3 Black stones to be made prisoners. This brings the tally to 16 Black and White prisoners as stated in the problem.

Note that B1 at a is actually a better way to capture.


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