What do new Sudoku techniques teach us about real-world problem solving?
"Ontological remodeling" is a lovely term. I think it's ubiquitous actually, but another nice example is the puzzle about tiling a chessboard with dominoes when the board is missing two opposite corners. Can you do it? If so, how? If not, why not?<p>Btw is the footnote a joke? I don't really get it:<p>The sum of the digits 1 to 9 is 45[1]<p>[1] This is a secret that Simon only tells his closest friends.