Sudoku1 - Solve Method by Randomn
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Solve Method "Random"

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

In a cell with 2 possible numbers, we can choose one at random, and then we continue. If we arrive to an error or unavoidability, a come back is necessary because it means that the second number is the good one. This method is very difficult to use on paper and pen, because you have to note all values after this choice. With Sudoku1, use of keys Undo et Redo simplifies life.

 

It's the only method I found in case the grid has more than one solution. This method can be selected as automatic Sudoku1 method in the Method panel by a click on Random.

 

Here is a simple example.

Example 1 : Select one number among 2 can allow to unfreeze the grid.

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Number 3 selected in one cell of the center top block allows to find all yellow cells an go on. If we get freeze, we have to cancel all values et select the 6 for this cell.

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