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 box, check the candidate cells for each digit. If they all share a single row or column, the digit "points" out. Eliminate it from the rest of that row or column.
5
5
8
2
9
5
5
5
Worked example
In the highlighted box, the digit 5 can only appear in two cells - both in the same column. The column outside the box loses 5 as a candidate.
Time to practice
Reading is half the work. Try a puzzle now and look for the techniques you just learned.