(10 years ago) Very interesting. 4 off in 44 tries. And lacking ideas ... :S
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EDIT 2023, 14th May: Woo hoo, I finally managed to find the 210 path, here. For me, it was not easy to see, at all. :) I first had MUCH longer variations, then somehow came to cca 220, only today did I find closer and closer and finally got it. Unbeliveable good for the first level!
Sneaky tricks. It didn't take me long!.. Is what I would say if this level didn't take so many inputs. I wonder if a more compact version of this is possible.
Edit: This is my 100th professor at the time of this review (since ratings can change)
Insights