White threatens a snapback at a. If Black defends at a then he won't be able to kill the three white stones because of shortage of liberties. The situation results in seki.
![[Diagram]](../../diagrams/24/41a20c5c4c8ddc793901314f34a1ed13.png)
Final seki
This is how the seki looks after adding
and
.
neither player can play on the points
because they are auto Ataris