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Example of a Forcing Chain: Let's say we have the following grid: 8 3 _ | _ 6 _ | _ 7 9 _ 2 _ | 7 _ _ | 5 _ _ _ 6 _ | _ _ _ | _ 1 _ --------------------- _ 9 _ | _ _ _ | _ 8 _ _ 5 _ | _ 3 _ | _ _ _ 2 _ _ | _ _ _ | _ 4 _ --------------------- In this grid, we can identify a single chain involving the numbers 1 and 7 in row 3: Cell R3C2 has candidates 1 and 7. easy sudoku online freemost difficult sudoku in the world By incorporating Sudoku puzzles into your daily routine, you can enhance your cognitive abilities, enjoy a relaxing hobby, and challenge your mind. Whether you are a beginner or an expert, you will find that Sudoku is both challenging and rewarding. printable sudoku puzzles for free Learn the Rules : Before diving into the puzzles, familiarize yourself with the rules and symbols used in Killer Sudoku. nyt hard sudoku today
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