Lesson 03 · Sudoku Coach
Locked Candidates Sudoku lesson
Candidates confined to one line inside a box eliminate that digit farther along the line.
The working method
- 1.Find a digit whose candidates in one box all share a row or column.
- 2.Treat that shared line as locked by the box.
- 3.Remove the digit from other cells on the same line outside the box.
Evidence exercise 1 of 3
Find the proof, not the answer.
Select all 2 evidence cells that make this Locked Candidates deduction valid.
What to inspect
Candidates confined to one line inside a box eliminate that digit farther along the line.
Source puzzle · sudoku-0003
Candidate marks reflect a verified intermediate state from this published grid.
Use mouse, touch, or keyboard. Arrow keys move focus; Enter or Space selects a cell.