Hidden Pair
Two digits can only go in the same two cells of a house, so every other candidate leaves those cells.
How it works on this board
5 and 9 can appear only in the highlighted set of cells
9
5
4
4
5
8
9
4
9
3
5
6
1
2
8
5
4
7
3
4
3
6
7
7
3
2
5
6
6
3
9
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