Yet another candidate reduction technique has now been implemented in Pocket Sudoku: the XY-Wing. If you are not already familiar with it, read about it here, here and here (and on numerous other sites on the web).
Yet another candidate reduction technique has now been implemented in Pocket Sudoku: the XY-Wing. If you are not already familiar with it, read about it here, here and here (and on numerous other sites on the web).