Riddles, brain puzzles and mathematical problems

[Bridge]

Spoiler below!

1. Move the black knight on 1 to square 3.
2. Move the white knight on 7 to square 9.
3. Move the white knight on 5 to square 10.
4. Move the black knight on 6 to square 5.
5. Move the black and white knights on 3 and 9 to squares 2 and 8.

Can't get any farther at the moment. This is a really tough puzzle and I don't really want to waste my evening on it.