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X-Chain , How to solve sudoku puzzles - Solving sudoku strategy
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HoDoKu: Solving Techniques - Chains and Loops
HoDoKu: Solving Techniques - Chains and Loops
Techniques: Forcing Chains - Sudoku Of The Day
SudokuWiki.org - XY-Chains
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Chain that completely cracks the puzzle straight from single digit eliminations using an interesting strong link between 4 in r2c5 and 8 in r3c4, eliminating 4 in r2c4 : r/sudoku
XY-Chain , How to solve sudoku puzzles - Solving sudoku strategy