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hardest sudoku in the world For example, if you have a row with the numbers 1, 2, 3, 4, 5, 6, and 7, but the cells in positions 1, 4, and 7 are already filled with 1, 4, and 7, respectively, you can deduce that the cells in positions 2, 5, and 6 must contain the numbers 2, 5, and 6. dadsworksheets sudoku Chain Reaction A chain reaction occurs when solving one part of the puzzle leads to a change that simplifies another part. X-Wing: An X-Wing is a pattern formed by two pairs of numbers in two rows or columns that intersect at a 2x2 square. how to solve hard sudoku without guessing
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