213WN notcher

    Keywords: Life & Death
[Diagram]
213WN  

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

[Diagram]
Black lives with a  

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

[Diagram]
Black lives with b  

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

[Diagram]
Demo  

(B1 protects against capture)

[Diagram]
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]

[Diagram]
213WN  

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

[Diagram]
Reading exercise  

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


213WN notcher last edited by Unkx80 on November 20, 2008 - 21:21
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