Sudoku Puzzles Solution Tips 3

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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