213WN notcher

    Keywords: Life & Death
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213WN

This is an unsettled critical notcher. Anything weaker is dead. a or b make life.

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Black lives with a

Playing a: after B1 W2 and B3, black can make life at either of the circled points.

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Black lives with b

B1 lives as well: it makes two sure eyes at the circled points.

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Demo

(B1 protects against capture)

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213WN Failure

B3 is a mistake after B1-W2: White descends with W4 to create shortage of liberties .After B7, White starts a ko for the life of this group. [1]

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213WN

Black must be careful after the sagari at W2. a is now the only way to live without ko.

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Reading exercise

An easy reading exercise, but Black has to be careful. How to answer the hane at W2? See Beginner Exercise 280.


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