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Additionally, the grid is divided into nine 3x3 subgrids, called "boxes" or "blocks". extreme sudoku booksudoku to print free These involve identifying patterns in the grid that can eliminate certain numbers in rows or columns, making it easier to fill in the blanks. sudoku to print free How to Fill Sudoku: A Step-by-Step Guide to Mastering the Puzzles Sudoku is a popular puzzle game that challenges your logic and problem-solving skills.
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Use the X-Wing Technique : The X-Wing technique involves identifying two rows or columns that have two possible numbers in the same two boxes. extreme sudoku book 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. sudoku brain training benefits
