[hinkley]

I just bumped into The Phistomefel Ring last week watching one of his videos, but in the one I watched he claimed there was a second variant on the PR, which he used to solve a Sudoku that couldn't be solved by a computer without brute force.

I'm about to start with a new programming language. I think I might want to go back to Peter Norvig's Sudoku solver and layer these data structures on top.