Beginner Exercise 154 / Solution

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Solution

[Diagram]

Life

W1 is forced to prevent snapback and at the same time lives.

[Diagram]

Seki

Later B1 - B3 can make seki. Or White can simply play W2 for 7 points in the corner.


Failure

[Diagram]

Ko

W2 allows B3 to start a ko, which White takes first at a. However, this result is inferior to unconditional life (including seki) as per tsumego conventions.

(In practice, White may choose this line only when value of the move is very small and ko threat situation is exceptionally good.)



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