Gokyo Shumyo, Section 1, Problem 82 / Solution

Main line  

Variation ^[1] discusses at .

Continuation  

Variation ^[2] discusses .

Continuation  

is atari. If Black a, White b catches him short of liberties.

Variation 1  

If at here, makes life with a potential bent four, which Black cannot spoil with an atari as when there were a stone at a.

Variation 2  

If at here, and sets up a snapback, denying White her second eye.