The First Solutions
Chessboard size 40×40
1, 3, 5, 2, 4, 9, 11, 13, 15, 6, 8, 19, 21, 23, 30, 32, 34, 36, 38, 40, 31, 33, 35, 37, 39, 20, 22, 14, 18, 10, 12, 24, 17, 7, 28, 26, 16, 29, 27, 25
1, 3, 5, 2, 4, 9, 11, 13, 15, 6, 8, 19, 21, 23, 30, 32, 34, 36, 38, 40, 31, 33, 35, 37, 39, 20, 22, 14, 18, 10, 12, 24, 17, 7, 28, 26, 16, 29, 27, 25