Complex Naked Single
Use a pair or another technique to eliminate candidates from a cell until only one digit remains.
How 3 is placed
The 4–5 pair uses both digits, ruling them out at row 8 column 2
6
45
9
1
45
2
7
9
6
7
8
3
2
9
5
8
3
7
4
8
6
1
4
3
7
4
6
345
1
2
7
9
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