xref: /plan9-contrib/sys/games/lib/sudoku/boards/hard-2005-05-01.su (revision a8e650f8b6804428114023f948a3fb1a4d7b82d3) 
1.362..17.
29.....2..
3...8.5...
4....8.7.6
5.5.....3.
63.4.7....
7...4.7...
8..8.....7
9.49..832.
10836249175
11915763248
12472815693
13291384756
14657192834
15384576912
16163427589
17528931467
18749658321
19