OneThousandAndOneLifeAndDeathProblems/Erratum 12

Describe OneThousandAndOneLifeAndDeathProblems/Erratum12 here.

The book explicitly states that there are no problems that need a ko to solve, but in this one the answer doesn't mention a move by white that forces a ko!

The solution given in the book:

[Diagram]

Claims that black can win with no ko

But if white plays W4 at B5, white can make a ko! Watch:

[Diagram]

White can force a ko

And now we have a two-step ko for white, which, if won, kills black.


This is a copy of the living page "OneThousandAndOneLifeAndDeathProblems/Erratum 12" at Sensei's Library.
(OC) 2005 the Authors, published under the OpenContent License V1.0.
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