ProtoDeuteric- What about this? It seems to me that a and b are miai, and after that exchange, c and d are not options for white, unless he wants to make a thank you move. If white decides to play c after , then black would play a, and If white decides to play d, then black would perhaps play at a because connection is not an issue for black because white has no eyespace.
JoelR - This fails for Black. After , Black needs to play at both
and c. Essentially, White has more liberties inside once the play starts.