Gokyo Shumyo, Section 1, Problem 82 / Solution
Main line
Variation [1] discusses
at
.
Variation [2] discusses
.
Variations
[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.
[2]
If
at
here,
and
sets up a snapback, denying White her second eye.