Joined: 19/04/2008 05:22:28
If you mean by placing 1 of each 1,2,3,4,5,6,7,8 on a 9x9 square, then asking whether there is a box which we put any of 1,...,9 and complete it in a sudoku fashion, then it is pretty easy to disprove. The solution is
Put 123 on the first row, 456 on the second row, both in the top left box. Put 78 on the third row, top middle box. Now you cannot satisfy it no matter what, without even caring about the 1,...9.