This Sudoku-solving strategy helps remove potential candidates for cells, i.e., it won’t help you to pencil in any new numbers, but it will help to nail a number down within a specific row or column.įor example, from the image below, you can understand that the number 8 cannot be on the same row as the 8 displayed. This concludes that both paths lead to the same result, so you can dismiss 7 from the purple-marked cells. If the cell number (4,4) containing 5 & 7 becomes 7, the purple marked cells cannot be 7 anymore.Therefore, the purple-marked cells cannot be 7 anymore. Then the cell (6,8) containing 2 & 7 must be 7 because they are in the same sub-grid.
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