Yes, I know this is kinda late, but... Solution to the knight problem:

OO*OOOXO
 O O O O
O O O O
 * * X X
* * X X
** * XXX
*** X XX
** * XXX

-HappyMutant

Roger Phillips -- 3 sets of 14 knights:

1 1 1 . 3 3 3 3
1 1 . . . 3 3 3
1 1 1 . 3 . 3 3
1 1 . 1 . 3 . 3
1 . 1 . 2 . . .
. 1 . 2 . 2 . 2
3 . 2 . 2 2 2 2
. 3 . 2 2 2 2 2

There doesn't seem to be any leeway for variations.

Jon Palin, Andrew Ofiesh sent answers, too... but I'm not sure which one sent me this:
AAAXBBBB
AAXXXBBB
AAAXBBBB
AAXXXBXB
AXAXXXXX
AXXCXCXC
CXXXCCCC
BACCCCCC