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Hidden Pairs

Points.  A hidden pair is formed when all candidates of 2 digits in a house are restricted to only two cells. The two cells must contain the 2 digits. All candidates of other digits can be removed from the two cells.

 

 

Hidden Pair, Row.  In row 5, digits 1 and 6 are contained in only two cells. Therefore no other digits can be present in the two cells and the red candidates can be removed.

 

Hidden Pair, Column.  In column 5, digits 4 and 5 are contained in only two cells. Therefore no other digits can be present in the two cells and the red candidates can be removed.

 

Hidden Pair, Box.  In box 5, digits 3 and 9 are contained in only two cells. Therefore no other digits can be present in the two cells and the red candidates can be removed.