very difficult sudoku printable X-Wing: When two rows or columns share only two numbers in common and those two numbers appear in two cells, you can eliminate the other two numbers in those rows or columns. sudoku seattle times newspaper Use Advanced Strategies When you've mastered the basic strategies, you can try advanced strategies to solve difficult Sudoku puzzles: X-Wing: If two rows or columns have two cells with the same two numbers, and those two numbers appear in only those two rows or columns, the other two cells in those rows or columns must have those two numbers.
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