Go Problem of the Week

Like my Aikido Technique of the Week, the Go Problem of the Week idea didn't seem to take off as quickly/consistently as I had originally planned. I'm going to try to rectify that, and in interest of rectification, here's the next problem:

What should Black do to capture the marked White stones?



Black could move at 1, making sacrificing a stone to force White's hand:



White has to capture the stone with a move at 2 and then connect the two groups at 4 after Black plays at 3. Black moves at 5, putting all of the White stones in atari...White has no escape: