Complex Full House
In a row, column, or box with two empty cells, eliminate one candidate to determine which cell takes each missing digit.
How 6 is placed
The top-right box confines 8 to row 2, ruling it out at row 2 column 2
2
4
3
9
6
1
5
1
68
9
8
8
8
5
3
1
9
2
4
9
2
4
1
6
3
7
9
1
4
5
2
1
4
7
9
1
9
5
3
1
2
9
6
9
2
1
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