Thu, 31 Jan 2013 18:44:44 +0100
added solving algorithm
1 3 _ _ 2 4 _ _ 6 _
2 _ 4 _ _ _ _ _ 5 3
3 1 8 9 6 3 5 4 _ _
4 _ _ _ _ 8 _ 2 _ _
5 _ _ 7 4 9 6 8 _ 1
6 8 9 3 1 5 _ 6 _ 4
7 _ _ 1 9 2 _ 5 _ _
8 2 _ _ 3 _ _ 7 4 _
9 9 6 _ 5 _ _ 3 _ 2