Lesson 05 · Sudoku Coach
X-Wing Sudoku lesson
Two matching candidate pairs across two rows or columns lock a digit into four corners.
The working method
- 1.Find two rows where one digit appears in exactly the same two columns, or transpose the pattern.
- 2.Use the four candidate cells as the corners of a rectangle.
- 3.Remove that digit from the other cells in the two crossing columns or rows.
Evidence exercise 1 of 3
Find the proof, not the answer.
Select all 4 evidence cells that make this X-Wing deduction valid.
What to inspect
Two matching candidate pairs across two rows or columns lock a digit into four corners.
Source puzzle · sudoku-0001
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.