21 Sudoku Singles Chain
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3:26
22 Sudoku Pairs Chain
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13:55
dxSudoku #41 X-Chain Puzzle Solving Technique
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13:26
Remote Pairs Sudoku Chain Strategy
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16:43
Sudoku Mastery: X Wings, Y Wings & XY Chains
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42:55
X-Chain (Old Faithful!) / Sudoku Tutorial #27
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22:38
The Easy Way To Spot X-Cycles
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38:21
Extreme Sudoku: Chains, Chains And More Chains
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9:58