The First Solutions
Chessboard size 39×39
1, 3, 5, 2, 4, 9, 11, 13, 15, 6, 8, 19, 7, 25, 30, 37, 33, 28, 32, 38, 35, 39, 31, 36, 34, 21, 17, 20, 14, 12, 10, 23, 16, 18, 22, 29, 26, 24, 27
1, 3, 5, 2, 4, 9, 11, 13, 15, 6, 8, 19, 7, 25, 30, 37, 33, 28, 32, 38, 35, 39, 31, 36, 34, 21, 17, 20, 14, 12, 10, 23, 16, 18, 22, 29, 26, 24, 27