Tue, 28 Jul 2020 14:44:48 +0200
adds solver test
7 | 1 | _ _ _ 1 9 _ _ _ 8 |
2 | 1 _ _ 2 _ 7 9 6 _ | |
3 | 6 9 _ _ _ 4 _ _ _ | |
4 | _ _ _ _ _ _ 1 _ _ | |
5 | _ 5 _ 6 _ 9 _ 7 _ | |
6 | _ _ 3 _ _ _ _ _ _ | |
7 | _ _ _ 9 _ _ _ 8 1 | |
8 | _ 1 6 7 _ 8 _ _ 3 | |
9 | 9 _ _ _ 1 2 _ _ _ |