Sudoku Solution Examples
3. Searching
for Single Candidates

Often only one number can be in a
square because the remaining eight are already used in the relevant
row, column and box.
Taking a careful look at Square b4 we can see that 3, 4, 7 and 8 are
already used in the same box, 1 and 6 are used in the same row, and
5 and 9 are used in the same column.
Eliminating all the above numbers leaves 2 as the single candidate
for Square b4
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