Game technique · Sudoku
Hidden Pairs in Sudoku
If two digits can occur only in the same two cells of a unit, those cells form a hidden pair.
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If two digits can occur only in the same two cells of a unit, those cells form a hidden pair.
Example
If 3 and 8 appear only in two cells of a box, remove all other candidates from those cells.
Key point
If two digits can occur only in the same two cells of a unit, those cells form a hidden pair.