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.


