This
doesn't work either.
If
at either a or b then white takes the other point, reducing the eyespace to a bulky five.
If
at c then
at a kills, while
at d will be answered by
at b.
here might look promising, but it's also a mistake which is punished by the clever sequence up to
.
If black plays
at a then
at b sets up a snapback.
at b is for example answered by
at a capturing the stones on the left.