Intermediate
Naked triple
Three cells share a three-digit pool between them.
A naked triple is three cells in a unit whose combined candidate set has exactly three digits. Each cell doesn't have to list all three — one might be {2, 5}, the next {2, 7}, the last {5, 7} — what matters is that the union across the three cells totals three digits, no more.
Once the pattern is identified, those three digits leave every other cell in the unit. Same logic as the naked pair, scaled up by one.
When the move applies
Triples are harder to spot than pairs. Look for clusters of cells with 2–3 candidates whose candidate sets overlap; if three of them collectively use only three different digits, you're there.
The procedure
- Find three cells in the same unit, each with 2 or 3 candidates.
- Verify their combined candidate set contains exactly three digits.
- Strike those three digits from every other cell in the unit.