wedges and then is a splendid move. Whatever Black does, will do the trick. If Black plays the shape point , then is atari and next White lives at a. If Black responds to at , then White can play and make two eyes at b or c.
If defends on the left, then after , Black has a problem. White can play at a to get an eye at b or capture black, or at c to capture either black or black . See next diagram