Sudoku strategy
X-Wing Sudoku Strategy
Advanced technique Advanced
An X-Wing locks a candidate into the same two columns across two rows, or the same two rows across two columns.
How to use it
- Pick one candidate digit.
- Find two rows where that digit appears in exactly two candidate cells.
- Check whether those cells line up in the same two columns.
- Remove that candidate from the other cells in those columns.
- The same logic also works with rows and columns reversed.
Practice: Hard and Expert puzzles are the right level for X-Wing practice after simpler candidate eliminations stop helping.
Practice this strategy
Use the interactive solver to practice this technique on a fresh puzzle. If you get stuck, the Human Solve mode can show the next logical step.