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University College Dublin

Mathematicians Answer Long-Standing “Minimum Clue” Sudoku Question By Checking Every Possible Puzzle

It's official. There are no Sudoku puzzles with 16 clues or fewer, and it took about a year to figure that out. Gary McGuire and his crew at University College Dublin were the ones who spearheaded the campaign to find an answer to this eternal question and wound up solving it with brute force. Well, brute force, a little ingenuity, and 7.1 million core-hours of processing time on a machine with 640 Intel Xeon hex-core processors.

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