The rule of Sudoku is simple: Fill in the empty cells in the grid so that each row, column and box contains the number 1 to 9.Notation
We will refer to a particular cell in the grid using the notation R#C#. For instance, the cell in the third row and fourth column is denoted as R3C4.
The 9 boxes of 3x3 will be labeled with A-I in the following manner:
The most systematic way to solve Sudoku is to meticulously maintain a list of possible candidates for each cell. This process is usually tedious, error-prone and detracts the fun out of Sudoku. For a start, we will look at some of the simple strategies. *The list here will be updated from time to time:
1) Squeezing.
2) Cross-hatching