StivStiv 162k1212 gold badges588588 silver badges875875 bronze badges $endgroup$ 2 $begingroup$ Dang which is tricky. I am not used to wondering like that. Many thanks for that approach. $endgroup$ tazboyTo resolve medium Sudoku puzzles, all you would like is actually a pencil and eraser (or maybe a electronic Sudoku app or Site). It can even be he