xref: /plan9-contrib/sys/games/lib/sudoku/boards/hard-2005-05-21.su (revision a8e650f8b6804428114023f948a3fb1a4d7b82d3) 
1.3...5..2
2..2.6..8.
3.9......7
4..9.765..
5.5.9.8.1.
6..154.6..
79......4.
8.6..8.2..
97..3...9.
10437895162
11512764983
12698213457
13349176528
14256938714
15871542639
16985627341
17163489275
18724351896
19