Naked Singles
The method Naked Single is the simplest method we all use when we solve Sudoku. We simply observe that
a given cell has all but one 1-9 numbers as neighbours (either in row, column or square). Therefore, there
is only one possibility for the given cell.
Naked Singles - Example 1
Consider the green cell I4 in the following example. It “sees” 1, 2, 6 and 7 in the same row, 5, 4 and 8 in the same column and 1 and 3 in the same square. It can be neither of these values, so the only possibility left for this cell is 9.
Naked Singles - Example 2
Let us look at another example. The cell B4 has neighbours 5, 4, 2 (row), 7, 8, 3, 1 (column) and 7, 9, 4 (square). The only possible value left for B4 is 6.
Naked Singles - Example 3
When you have the candidates option turned on, a Naked Single is simply a cell with only one possible value in it.
