When three cells in the same unit have candidates that are subsets of the same three digits, those three digits can be eliminated from other cells in the unit.

A Naked Triple is the three-cell extension of a Naked Pair. When three cells in the same unit have candidates that are subsets of a total of three distinct digits, those three digits cannot appear in any other cell in the same unit.

Understanding Subsets

If three cells have candidates {2,5}, {2,8}, and {5,8} respectively, they form a Naked Triple of {2,5,8}. Each cell does not need to contain all three candidates - they only need to be subsets of the same three digits.

Difficulty of Detection

While Naked Pairs only require finding cells with exactly two candidates, Triples require examining combinations of cells with 2-3 candidates, making them significantly harder to spot. Systematic scanning is essential.