The XY Wing a.k.a. the Y Wing: A Useful Sudoku Solving Technique When You Are STUCK !!!
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Solving a VERY easy Sudoku Puzzle for the Absolute Beginner
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Crack Hard Sudoku Puzzles With the Skyscraper Pattern
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Solve a HARD Level Sudoku the EASY way! X wing, W wing, XY wing, and even a BUG +1
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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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The Sudoku Trick All Expert Solvers Know
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Empty Rectangle and the LOGIC Behind It
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This AMAZING Trick Can Solve Extreme Sudoku
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