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X-Wings and the Rectangle Rule for Solving Medium to Hard Sudoku Puzzles
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Х-wing - an Advanced Sudoku technique
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Y-wing (XY Wing) - an Advanced Sudoku technique
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Sudoku Tutorial #62. How to spot an X wing using rows, and then knowing what to do!
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Sudoku Solving Tip - X Wing Technique
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In which I solve an EXTREME SUDOKU for Twitter
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Sudoku Tricks: The X-Wing And How To Spot It
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The XY Wing a.k.a. the Y Wing: A Useful Sudoku Solving Technique When You Are STUCK !!!
