Sudoku solver
The Excel workbook presented in this article indicates numbers for insertion in a current puzzle to solve it.
Certain strategies for finding single values in any cell may be represented as calculation schemes with Excel formulae. QRS has developed such a file and makes it available to interested visitors. The strength of the currently implemented strategies allows to solve a good part of medium grade puzzles.
Concept
To avoir circular references, the candidates found are shown in a copy of the puzzle. The values must be entered manually in the puzzle, launching formula evaluation, wich removes the value just entered and eventually brings up new candidates. When no more candidates show up when the puzzle is not full, the strategies are not strong enough.
Demo
the following video shows the solution of a puzzle by manual entry of the values indicated until all cells are filled.
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