Hidden Pairs

Hidden Pair

If there are two cells in a house (row, column, box) where there are two candidates that appear nowhere outside these cells in the same house - those candidates must be placed in the two cells.

All other candidates can therefore be eliminated from these two cells.

Take a look at column C5.
R2C5 and R7C5 both have '2' and '5' as candidates. Also, '2' and '5' are not candidates of any other cell in this column.
Sudoku Hidden Triples

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