Game technique · Sudoku
Empty Rectangle in Sudoku
A box can form an empty-rectangle pattern for a digit when its candidates lie on a crossing row and column.
🎮 Play Sudoku →How it works
A box can form an empty-rectangle pattern for a digit when its candidates lie on a crossing row and column.
Example
Combine that box pattern with a strong link outside the box to eliminate the digit at the opposite intersection.
Key point
A box can form an empty-rectangle pattern for a digit when its candidates lie on a crossing row and column.