How to read the grids
- Given - clues from the starting puzzle
- Subject - cells the technique focuses on
- Eliminated - candidates this technique removes
- Candidate - pencil marks shown for reference
How to spot it
For each unit, list which cells can hold each digit. If two digits have an identical pair of candidate cells, the cells form a hidden pair. Strip everything else from them. Hidden triples work the same with three digits sharing three cells.
4
7
1
5
4
7
6
Worked example
In this row, only two cells can hold a 4 or a 7. Even if those cells also pencil 1, 2, 5, the only digits that can stay are 4 and 7.
Time to practice
Reading is half the work. Try a puzzle now and look for the techniques you just learned.