Sudoku1 - Single Method
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Solve Method "Single"

For a comprehensive reading, please refer to Sudoku1 Grid definitions.

 

For a block, we have to verify all lines and columns owning already a given number. By crossing, we can eliminate cells and found the only one where this number is possible.

This method simple is generally enough for a medium grid. It is selectable as Sudoku1 automatic solve methods in the Method panel by a click on Single. When the number is found in all blocks of the grid, you can notice it in the Found Number Area at bottom right of the window, in order to remember that this number has been solved for the full grid.

Here are some simple examples.

Example 1 : For a block and a given number, we check all possible cells.

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Number 1 is already in lines and columns indicated. By crossing the only possible cell in the block is easily found.

Example 2 : A block can allow to solve an other block.

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In the middle block, Number 1 is not possible in the middle column, nor in the right column (purple). He must be in the left column (oval). For the upper block, the 1 can not be in the indicated lines and columns, so it is in the center cell.

 

 

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