I've got this far:
. 2 9 |. 3 . | . 8 . |
1 . . |. 2 . | 3 7 9 |
. . 3 |. 1 . | . 4 . |
. . . |. 9 2 | . . . |
9 . . | 4 8 1 | . 3 7 |
. . . | 7 6 . | 9 . . |
5 6 1 | 2 7 8 | 4 9 3 |
2 9 7 | . 4 . | 8 . 5 |
. 3 . | . 5 . | 7 2 . |
Help please on just one step.