I have not seen a pipelining tutorial that focuses on this specific technique before. A cool one I need to watch for opportunities to use in the future.
You know, this level is actually pretty good. I would say that, this level teaches you something essential to learn as a player and uses a sledgehammer to reinforce it.
Beginners beware though; this is one of those levels that would probably drive a beginner insane, but is a must play for any intermediate+ player.
I think I got it by PURE luck, in 3rd try. Am having some thoughts WHY I was solving the way I was, but cannot say that I was sure or that I really understand. With me and holes it's mostly just trying. Huh.