The First Solutions
Chessboard size 50×50
1, 3, 5, 2, 4, 9, 11, 13, 15, 6, 8, 19, 7, 22, 10, 25, 27, 36, 38, 40, 45, 43, 48, 46, 39, 37, 50, 41, 44, 42, 47, 49, 20, 18, 24, 26, 30, 12, 16, 21, 17, 14, 31, 35, 23, 29, 33, 28, 34, 32