Possibility Explanation [Page 7 of 15])

   

You will often be wondering what numbers can go in particular Sudoku squares. Many other Sudoku puzzle solvers do not give detailed explanations of what can go where and why.

Sudoku Dragon has a clear explanation of why certain numbers are not possible according to the Sudoku rules. You can select the 'depth' of analysis to determine which strategies will be made use of in making the explanation. In the case illustrated only the numbers '1' and '4' are possible as all the other possibilities are excluded due to a conflict with a number in a row, column or region.

The program can also make use of more complex twin and shared subgroup exclusion rules to determine possibilities. These exclusion rules knocked out the possibility of 6;7 and 9 occurring in this square. The analysis has also spotted that '4' forms one of an alternate possibility pair.

The possibility panel is conveniently located just to the right of the main puzzle display.

You can download SudokuDragon for a free 23 day trial and investigate the possibility explanations for yourself. Go to our download page.

• Tour Guide Introduction
• Generating a new Puzzle
• The square allocation list
• All forms of Sudoku
• Puzzle hints
• Annotating individual squares
• Explaining possible square assignments
• Showing possible square assignments
• Looking at possibilities
• Automatic allocation for 'easy' squares
• Marking Sudoku squares
• Contribute your puzzle
• Larger Sudoku grid sizes
• League Table
• Change grid appearance

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