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Lyndenlea

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The First Solutions
Chessboard size 23×23

1, 3, 5, 2, 4, 9, 11, 13, 18, 20, 22, 19, 21, 10, 8, 6, 23, 7, 16, 12, 15, 17, 14

Diagram of the first possible solution to the 23 Queens on a 23x23 chessboard problem