5 Jun
2003
5 Jun
'03
10:13 a.m.
Here's an excerpt from another mailing list http://groups.yahoo.com/group/mathpuzzle/
From "Jean-Charles Meyrignac" <euler@free.fr> 20 knights, each attacks 3 others, on a 7x7 board. 32 knights, each attacks 0 others, on a 8x8 board. 32 knights, each attacks 1 others, on a 8x8 board. 32 knights, each attacks 2 others, on a 8x8 board. (single path possible) 32 knights, each attacks 3 others, on a 8x8 board. (the solution is unique). 36 knights, each attacks 3 others, on a 9x9 board.
Jean runs the site http://euler.free.fr/ I haven't noticed the 0, 1, 2, 3 together. I think I've usually just seen the 0 solution (I remember it in Gardner's works.) --Ed Pegg Jr, www.mathpuzzle.com