Our valiant knight is about to embark on a longer tour than usual, but he doesn't mind, because there is a lovely young maid waiting at his destination.

The Knight enters the upper chess board at number 1, visiting each cell, just once, in numerical order. When he reaches number 64, he makes another Knight's Move to number 65 in the lower board. He then proceeds in the same manner until he reaches his destination at number 128.

Can you recreate the tour?

6                                                                                           128

KEY:
Blue = cube numbers (1, 8, 27,64 and 125)
Green = squares which are not cubes (4, 9, 16, 25, 36, 49, 81, 100 and 121)
Red = prime numbers (2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113 and 127)
Yellow = multiples of ten which are not square (10, 20, 30, 40, 50, 60, 70, 80, 90, 110 and 120)
Purple = multiples of 11 not included in any other category (22, 33, 44, 55, 66, 77, 88 and 99)
Gold = multiples of 17 greater than 60 (68, 85, 102 and 119)
Rose = multiples of 19 greater than 60 (76, 95 and 114)

Please refer to the above list of numbers for those which occur in more than one category.
Thanks again to Brianjn for all his help.

Thanks Charlie for confirming the uniqueness of the solution.

Gamer, If it's any consolation, these puzzles take me hours to solve!  I was intrigued (and impressed) by the fact that you used "strings" of four or five moves. I don't think I would be able to do that! When I am in the situation of having to fill blank cells, I concentrate on the corners and outer cells. Corners link to only two cells; those next to a corner link to three and all others along the edge link to just four. By considering the numbers I have left over and looking at the linking cells, I can finish the puzzle.

:) Josie

Posted by Josie Faulkner on 2008-07-13 11:46:18