Triplets (a.k.a Triples) and Hidden Triplets Explained - A Sudoku Strategy You MUST Know
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Locked Candidates as Elimination Techniques: Pointing and Claiming Sudoku Strategies
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This AMAZING Trick Can Solve Extreme Sudoku
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Empty Rectangle and the LOGIC Behind It
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Sudoku Tutorial #98 The power of triplets and matching pairs.
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Triples: the Single Most Important Sudoku technique?
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Hidden Pairs a.k.a. Hidden Matching Pairs – Solving a More Difficult Puzzle
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Sudoku 101: Hidden Triples
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