LOL N90. I have to admit I don't remember either. It was pure luck here too...hehe. I am sure tho that a better one with an odd number of moves (10 or even 8) exists.
Great level and nice design, OMG! Thanks TM for the challenge, it took me a lot of time to figure out your solution. In fact, I was certainly lucky, don't ask me to do it again :))