Crosswords, Puzzles and Sudoku
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Scooped by Giovanni Drago
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There is no 16-Clue Sudoku: Solving the Sudoku Minimum Number of Clues Problem

The original paper published by the university of Dublin, with the explanation of the methods employed to prove that there is no valid sudoku with less than 17 clues

Download at http://www.math.ie/McGuire_V1.pdf

Giovanni Drago's insight:

An understandable large review of the mathematical underlying methodology

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Scooped by Giovanni Drago
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The Minimum Sudoku problem: a collection of all the 17 clues valid sudokus ever found

Giovanni Drago's insight:

A unique collection of mathematical aesthetic,  given for free by the univesity of Western Australia

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