![[Diagram]](../../diagrams/29/bedf36a1dcb1e11e8b33c2d353ef17f3.png)
213WN
This is an unsettled critical notcher. Anything weaker is dead. a or b make life.
![[Diagram]](../../diagrams/33/38e03f178d5e42815f88c4debb0befd6.png)
Black lives with a
Playing a: after
and
, black can make life at either of the circled points.
![[Diagram]](../../diagrams/38/6731ee84d0c8ee0902a5b2d17e9b700a.png)
Black lives with b
lives as well: it makes two sure eyes at the circled points.
![[Diagram]](../../diagrams/38/ff6bf48c66d4a98202064032c6842117.png)
Demo
(
protects against capture)
![[Diagram]](../../diagrams/47/8635fdd12d4b19505b8c31f77e80fb1e.png)
213WN Failure
is a mistake after
-
: White descends with
to create shortage of liberties .After
, White starts a ko for the life of this group. [1]
![[Diagram]](../../diagrams/19/60beb72a4075d8422c8dac33c10c3dd7.png)
213WN
Black must be careful after the sagari at
. a is now the only way to live without ko.
![[Diagram]](../../diagrams/35/086879f1d8c70585f54acaaf17e5b5b2.png)
Reading exercise
An easy reading exercise, but Black has to be careful. How to answer the hane at
? See Beginner Exercise 280.