When I found that move it gave me a laugh because I try to add a trick move in every level I can. If not to solve, at least for a lower score. It makes score watching an added event.
It's kinda tricky. One small mistake (obviously I can't tell which in public) and it becomes impossible. Tried it many many many times till I figured it out. I have to say it is one of those levels I had extremely fun making it (lots and lots of tries) but is probably not very attractive to all the players. To make it a bit harder and more challenging I suggest finding that one move (not actually one but all are similar) which makes it impossible. Worth the try I think.