Hidden Triple

A Hidden Triple extends the Hidden Pair concept to three cells and three candidates. When three candidates appear only in three cells within a house, all other candidates can be eliminated from those cells.

Technique

1. Within a house, find three digits that appear only in the same three cells.
2. Those three cells must contain those three digits.
3. Eliminate all other candidates from those three cells.

Tips

• Hidden Triples are harder to spot than Hidden Pairs - look for three rarely-occurring digits.
• Not all three cells need to contain all three candidates.
• Use a systematic approach: check each combination of three digits.