KNIGHTSTOUR
Knight's tour
A knight's tour is a sequence of moves of a knight on a chessboard such that the knight visits every square exactly once. If the knight ends on a square that is one knight's move from the beginning square, the tour is closed, otherwise it is open. The exact number of open tours on an 8x8 chessboard is still unknown.The above text is a snippet from Wikipedia: Knight's tour
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