Finally beat this after many months of trying. Getting the newly discovered 71 was incredibly difficult. Easily the hardest level I have beaten so far. I was probably why it was rated at Grandmaster briefly before it was demoted.
Bravo for the level design Raszlo and the amazing optimal route found almost two decades later.
I was lead here by a puzzle called "Black Hole" and its reviews.
I just demoted this to Professor. If not for that, this would've been my first Grandmaster!
Insights