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# Solving Techniques 4 Pointing Pairs

It often happens that the possibilities of boxes, rows and columns have been exhausted and eight cells are filled with two remaining (the technique also works with three remaining). Also, there are cases where the two remaining cells are next to each other either in a row or column. This technique can be applied in these cases.

## Pointing Pairs

Let’s look at the upper middle box. There is a 4 in H4, so it can’t be entered in the 4th column.
Also, since there is a 4 in the second row, B7, a 4 can’t be entered there.
Hence, the cells where a 4 can be entered in the upper middle box, are either A6 or C6.
Therefore, in the center middle box, a 4 can only be entered in column 5.
As you can see, in pointing pairs, you look for pairs or triple numbers and eliminate the possibility of them belonging in other cells.

## Pointing Pairs-2

In the upper middle box, a 6 can only be entered in row B.
Similarly, in the center middle box, a 6 can only be entered in row D.

Now that we have a [6,6] pair in the upper middle box, a 6 can’t be entered in the lower middle box’s columns 4 and 5.

Hence, in the lower middle box, a 6 is only possible in column 6.
As you can see, this is a technique of slowly narrowing down the candidate numbers.

## Names of cells in Sudoku

 A1 A2 A3 A4 A5 A6 A7 A8 A9 B1 B2 B3 B4 B5 B6 B7 B8 B9 C1 C2 C3 C4 C5 C6 C7 C8 C9 D1 D2 D3 D4 D5 D6 D7 D8 D9 E1 E2 E3 E4 E5 E6 E7 E8 E9 F1 F2 F3 F4 F5 F6 F7 F8 F9 G1 G2 G3 G4 G5 G6 G7 G8 G9 H1 H2 H3 H4 H5 H6 H7 H8 H9 I1 I2 I3 I4 I5 I6 I7 I8 I9