![[Diagram]](../../diagrams/25/c895b57b7817249d8bd2cf99df98de05.png)
Black to play
It looks very hard to avoid a seki but Black can set up a ko with
-
. However where can he find a ko threat?
![[Diagram]](../../diagrams/14/464dba21ab4d06107c38d360f3c38c41.png)
Black to play
The key is
, due to shortage of liberties white can't connect at
. But after Black captures at
White has no ko threats and Black captures everything.