Doesn't seem to be anything fancy to do here. If Black simply connects with , I don't see a way for white to save her 5 stones, and thus her group. a is self-atari, b is met by a to give black 2 liberties to white's 1, c is met by d or a to capture. Am I missing something? There does not appear to be any other way for white to escape or make two eyes.
~Alex Baxter