Naked Triple
nakedTriple
LevelNot seen in a hint yet
How it works
If three cells in one house share three candidates between them — that is, the union of their candidates is just three digits — those three digits use up all three cells. No cell needs all three: two each is enough as long as the union is three.
It is a Naked Pair widened by one cell, hence the shared name (triple = three). Those three digits are removed from the rest of the house. Unlike a pair it takes counting the union to see, which makes it easy to miss.
Worked example
5
1
3
4
2
8
9
9
2
3
5
4
7
1
9
3
5
2
1
8
6
8
9
3
5
1
7
3
4
6
2
1
9
5
8
5
2
9
8
3
4
1
8
1
6
7
9
5
2
3
4
● evidence✕ eliminated★ confirmed
In row 4, the 3 cells R4C2, R4C4, R4C8 have no candidates other than 2, 4, 7 (marked ●).
Those 3 cells share 2, 4, 7 between them, so those digits are removed from the other 4 cells of row 4 (✕).
Examples I encountered
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