xref: /plan9-contrib/sys/games/lib/sudoku/boards/hard-2005-04-03.su (revision a8e650f8b6804428114023f948a3fb1a4d7b82d3) 
1.2...6.7.
2..62.5...
33..9....1
44...3.1..
515.....34
6..8.5...9
79....3..6
8...8.94..
9.8.1...9.
10821346975
11796215348
12345987621
13469738152
14157692834
15238451769
16914573286
17572869413
18683124597
19