Last Digit
A digit already placed eight times goes at the intersection of the row and column still missing it.
How it works on this board
The last 9 goes where the row and column without a 9 intersect
6
5
7
8
1
2
9
1
3
4
6
9
5
8
9
2
8
3
7
4
6
1
5
9
4
7
8
2
8
6
2
9
9
2
9
6
9
5
8
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