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Lyndenlea

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The First Solutions
Chessboard size 20×20

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

Diagram of the first possible solution to the 20 Queens on a 20x20 chessboard problem