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Lyndenlea

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The First Solutions
Chessboard size 21×21

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

Diagram of the first possible solution to the 21 Queens on a 21x21 chessboard problem