This is an unsettled critical notcher. Anything weaker is dead. a or b make life.
Playing a: after
and
, black can make life at either of the circled points.
lives as well: it makes two sure eyes at the circled points.
( protects against capture)
is a mistake after
-
: White descends with
to create shortage of liberties .After
, White starts a ko for the life of this group. [1]
Black must be careful after the sagari at . a is now the only way to live without ko.
An easy reading exercise, but Black has to be careful. How to answer the hane at ? See Beginner Exercise 144.
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