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Solving Techniques 1
Hidden Singles

Finding the last remaining number based on already confirmed numbers is very simple and it's the most basic technique used in Sudoku.

BOX

8's are already filled in as candidates in the G3 and F9 cells. This means that in the lower right hand box, an 8 is in the H7 cell.


Line

In the B Line, there are no 5's. In the upper left and upper right boxes, there are already confirmed 5's, which leaves B5 and B6 as the only options. Since there is already a 5 in E5, the number 5 can't be in column 5, hence confirming that it is in B6.

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Line

Likewise, for E6, there are 2's in rows D and F and since there is a 2 in column 4, the 2 is therefore in E6, in the center block.

The hidden singles technique is a basic method to solve Sudoku problems.

This method of eliminating potential numbers in cells for rows, columns and boxes, until the last possible number remains, is at the foundation of Sudoku and it will be used at all levels.
Most of the beginning level problems on this site can be solved, solely using this method.

Names of cells in Sudoku

A1A2A3A4A5A6A7A8A9
B1B2B3B4B5B6B7B8B9
C1C2C3C4C5C6C7C8C9
D1D2D3D4D5D6D7D8D9
E1E2E3E4E5E6E7E8E9
F1F2F3F4F5F6F7F8F9
G1G2G3G4G5G6G7G8G9
H1H2H3H4H5H6H7H8H9
I1I2I3I4I5I6I7I8I9

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