The simpler solution would be a placement on the second line. forces
, and
reduces the eye at the bottom to one in sente.
Why sente? Because if White obstinately makes the other eye with , Black captures White with
.
If simply captures the two Black stones, then
cuts and captures two White stones.
The placement at the first line also works, but and
are probably a blind spot.
If simply captures the two Black stones, Black can simply set up a snapback with
and
.
is incorrect. Although
is a ploy to reduce the eye in sente, but
answers correctly and lives.
and
are miai.
Black makes a throw-in at , but White occupies the vital point of the bulky five with
and lives.
See also: