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
Sweep each row and each column for a digit. If all candidate cells for that digit fall inside a single box, the digit must be placed there. Strip it from the rest of the box.
6
6
8
2
9
1
3
4
6
6
6
6
6
6
Worked example
In this row, the digit 6 can only be placed in cells that all belong to the left-center box. 6 can now be removed from every other cell of that box.
Time to practice
Reading is half the work. Try a puzzle now and look for the techniques you just learned.