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Naked Quadruples: Identify four cells with four possible numbers, and eliminate those numbers from the other cells in the same row, column, or subgrid. killer sudoku calculatorsudoku xy chain You can carry them anywhere, making them the perfect activity for long commutes, waiting rooms, or even during a coffee break. 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 jigsaw
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