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Hidden Singles by Box |
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If a number only shows up as a candidate in one cell of a box, you may set that cell value to be that number. In the example below the candidate 6 is only found in the bottom-right cell of the box. Since each box must contain one 6, this cell must be the 6. This is a hidden single by box and is given a Sudoku Snake skill value of 1.
Like with hidden singles, this technique can be spotted without filling in the candidates by visualizing the elimination of units and seeing what remains. The above example is repeated below in this manner. By visualizing the elimination of the shown columns and row, it can be seen that the bottom-right cell of the middle-right box must be a 6.
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