Beginner Exercise 288 / Solution

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[Diagram]

Solution

Black fights a ko for life.


[Diagram]

Failure

Black can secure an eye at the bottom with B1, but then White will destroy the eye on top with W2 and kill the whole black group. After that, black is reduced to one eye: a and b are miai. W2 at c also kills, but is inferior, giving Black one more ko threat.

[Diagram]

Failure

B1 is a weak defense. White can kill with W2, a or even b. In either case, black can't make a second eye at the bottom.



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