/* Beispiel aus "DIE ZEIT" vom 12.06.2006 schwer */
8 0 0 0 9 0 1 0 0
0 7 0 0 0 0 8 3 0
2 0 0 0 7 0 0 9 6
0 0 5 0 2 0 0 6 1
0 8 0 0 6 7 0 5 3
0 9 0 1 0 0 0 0 4
0 5 0 0 0 0 0 0 9
0 1 7 0 0 0 0 2 0
0 0 8 0 0 0 5 4 0