by Pupp » Thu Jul 09, 2020 1:10 pm
I can only guess if the one I plugged into the rater was the world's hardest, but that particular problem has been posted in this forum as very hard, or "hardest". I'm pretty sure the problem I used is mentioned multiple times in this forum, in a variety of threads.
In any event, I only used it as a way to gauge the upper bound of whatever rater I was using. A rater is useless if you don't have a clear idea of what it considers an extremely hard puzzle, and an idea of what it considers "easy", "Medium", "hard", "expert", etc from whatever your using to get sudoku problems. (IE: app, website, book, etc.)
That link you gave me is dead.