new puzzle strategy for solving sudoku
Basic strategies
Starting a new puzzle
To solve sudoku puzzle, we have to use only logic, and to follow simple rules: each line, column and block must contain each of the numbers 1 to 9.
This first strategy will use literally the rule. We have to search in lines, columns and blocks if there is one missing number.
Example
In the following examples, you will see it is very easy to find numbers in yellow cells.
In the top line, yellow cell is the only one empty. All numbers 1 to 9 are present in the row, except the number "4". We have to put this number in the yellow cell of the top row.
Same technique is to apply to the first box and first column of this example.
Remember it is note possible to use this strategy for all sudoku puzzles. There should be only one missing number in a box, a column or a row.
List of methods
