The sequence of and
is the key. Note that if Black captures the three white stones, the group will get a second eye and lives.
The rest is atari all the way.
Which ends in a shunt after . Ironically, the
stone appears to be at a very beautiful position but does not help White at all.
If , Black lives simply by atari at
and
.
Same case.
The jump at will only cause the entire chain to be captured.
The direct atari at does not work.
The sequence of and
is wrong. After
, Black is dead.
The smart aleck move at will only remove White's weakness.
See Kyu Exercise 5 / Attempts for more discussion.