Indeed. Imagine what a better place the world would be if John had been alive these last 30 years. Have a happy and peaceful holiday season, whatever you celebrate.
As found on BoingBoing. 1. This procedure works for the simpler puzzles only. It does not address intermediate and advanced solution steps. 2. I have never resorted to writing little numbers since I consider it cheating. The real way to solve sudoku is to figure it all in your head.