I don't agree on hi19hi19 comment. I had one route winning after several tries. Why this one? I don't know. I couldn't identify anything specific that I did different from my previous tries. So, if there is a "trick" to be learnt, I failed to see it.
Wasted space aside, I think this is a very good introduction to this pattern. When making loops around a grid like this it's extremely easy to get stuck 4 off, and learning why the cut works when you get it is important.
