> time coffee knight.coffee
100000 tours found (showing first and last)

------
   1   4  57  20  47   6  49  22
  34  19   2   5  58  21  46   7
   3  56  35  60  37  48  23  50
  18  33  38  55  52  59   8  45
  39  14  53  36  61  44  51  24
  32  17  40  43  54  27  62   9
  13  42  15  30  11  64  25  28
  16  31  12  41  26  29  10  63

------
   1   4  41  20  63   6  61  22
  34  19   2   5  42  21  44   7
   3  40  35  64  37  62  23  60
  18  33  38  47  56  43   8  45
  39  14  57  36  49  46  59  24
  32  17  48  55  58  27  50   9
  13  54  15  30  11  52  25  28
  16  31  12  53  26  29  10  51

real	0m29.741s
user	0m25.656s
sys	0m0.253s