I would appreciate thoughts on the below since I don't see this variation in the library and feel I did not play optimally. I recently played a game where black played the cut on the inside and then played Atari instead of crawling (see this sequence under the "Atari" heading here: http://senseis.xmp.net/?34PointHighApproachOneSpaceLowPincer33Attachment
As white, I played the normal response with an extension to "2", but black responded with 3 instead of playing at a.
The result was this with white to play: