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No Magic In A Knight's Tour

morgothan writes "As reported in an article on Math World the solution, or rather lack of solution has been found to the over one hundred fifty year old math problem of how many numbers of magic tours a knight can make on a standard 8x8 chessboard. It turn out that there exist one hundred forty distinct semimagic tours, but no magic tour. The solution came after 61.40 CPU-days, corresponding to 138.25 days of computation at 1 GHz, the project was completed on August 5, 2003 in which every possible enumeration was tried out. The author of the software that finally solved the problem has also put up a webpage in which he further explains the problem and his method of solving it." Thanks to Mig for pointing out a great background page on Chessbase.com.

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  1. Re:A note to the anti-MS zealots by 91degrees · · Score: 1, Flamebait

    It's hardly impressive. No modern operating system randomly crashes for no reason at all (Windows 95 and the others that did crash after the counter wrapped were not modern operating systems). Windows isn't doing anything here, apart from memory allocation and a few highly predictable tasks.

    It's bad handling of errors in third party apps and drivers that usually kills Windows.