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xy wing sudoku Sudoku is a logic-based, combinatorial number-placement puzzle. The objective is to fill a 9x9 grid with digits so that each column, each row, and each of the nine 3x3 subgrids contain all of the digits from 1 to 9. killer sudoku book To solve a Sudoku puzzle, one must look for cells where only one number is possible, or rows/columns/blocks where a specific number has only one possible placement.
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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. xy wing sudoku This involves analyzing rows, columns, and subgrids to determine which numbers can be eliminated or placed in a specific cell. loco sudoku printable gamessudoku on paper With its grid of numbers and logical reasoning, Sudoku challenges players of all ages and skill levels. sudoku restaurant One such variant is Sudoku Billions Evil, which adds an extra layer of challenge and excitement to the classic game. This can happen as a result of filling in a single candidate, which then creates more single candidates, and so on. squiggly sudoku printable
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