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
Pick a digit. Find three rows where the candidate appears in only two or three cells, and those candidate columns are a subset of the same three columns. Same logic applies swapping rows and columns.
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
Worked example
Digit 2 appears across rows 1, 5, and 8 in columns 2, 5, and 9. Other cells in columns 2, 5, 9 (outside those rows) can no longer hold a 2.
Time to practice
Reading is half the work. Try a puzzle now and look for the techniques you just learned.