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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.

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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

A1A2A3A4A5A6A7A8A9
B1B2B3B4B5B6B7B8B9
C1C2C3C4C5C6C7C8C9
D1D2D3D4D5D6D7D8D9
E1E2E3E4E5E6E7E8E9
F1F2F3F4F5F6F7F8F9
G1G2G3G4G5G6G7G8G9
H1H2H3H4H5H6H7H8H9
I1I2I3I4I5I6I7I8I9

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