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