![[Diagram]](../../diagrams/38/30670cce470d347ad917b97d7d2246c7.png)
213WN
This is an unsettled critical notcher. Anything weaker is dead. a or b make life.
![[Diagram]](../../diagrams/18/82dac7e86da9adaa33b14ab55764517f.png)
Black lives with a
Playing a: after
and
, black can make life at either of the circled points.
![[Diagram]](../../diagrams/37/a765711708b833e917759894264290d2.png)
Black lives with b
lives as well: it makes two sure eyes at the circled points.
![[Diagram]](../../diagrams/16/c78286e6b195393d69a8a303eed4dd71.png)
Demo
(
protects against capture)
![[Diagram]](../../diagrams/41/a0af46a1fb2380a611d3e8ef6ca1db5f.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/44/e9272f6341058d7d74830cf5db023bf2.png)
213WN
Black must be careful after the sagari at
. a is now the only way to live without ko.
![[Diagram]](../../diagrams/10/c992e362436ec0826caf893523140769.png)
Reading exercise
An easy reading exercise, but Black has to be careful. How to answer the hane at
? See Beginner Exercise 144.
Authors