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Pigeonhole Principle: If a row, column, or subgrid has only one remaining cell that can accommodate a particular number, place that number in the cell. washington post sudoku onlinepdf sudoku puzzles For instance, if the rectangle contains the digits 1, 3, 5, and 7, eliminate these digits from the cells outside the rectangle that share a row, column, or box with any of the four cells in the rectangle.
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In this article, we will delve into the world of killer combinations, providing you with a comprehensive guide to mastering this aspect of the game. washington post sudoku online Checking Your Work As you solve the puzzle, periodically check your work to ensure that no numbers are repeating in any row, column, or subgrid. sudoku solutions step by step
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