Game technique · Sudoku
X-Wing in Sudoku
When a digit occurs in exactly the same two columns in two rows, those corners form an X-Wing.
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When a digit occurs in exactly the same two columns in two rows, those corners form an X-Wing.
Example
The digit occupies opposite corners, so remove it from other cells in those two columns.
Video guide
Key point
When a digit occurs in exactly the same two columns in two rows, those corners form an X-Wing.