There's this rather poor choice which easily allows White to push through with , and not only connect, but also capture 3 black stones.
togo: (Nearly) same thing with Black playing on the other side. Then again
is a double atari.
captures
, but then
captures
to connect.
togo: captures and connects, too, but in a less solid way (presenting Black with a ko-threat). Nonetheless it's interesting shapewise: If you imagine a white stone at 'a', then
not only captures
, but creates a backsnapping eye at
(which would be ko-dependent with
on 'b' as before).