X-Chain , How to solve sudoku puzzles - Solving sudoku strategy
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XY-Chains

Solving Sudoku
Sudoku designers the world over will weep and gnash their teeth at the revelations in this comprehensive guide to cracking the addictive puzzles--but

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Number of Possible Sudoku Puzzle Grids

Forcing Chain , How to solve sudoku puzzles - Solving sudoku strategy

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Multi-Colors , How to solve sudoku puzzles - Solving sudoku strategy

HoDoKu: Solving Techniques - Chains and Loops

Help on techniques to solve this puzzle : r/sudoku

A typical 9 × 9 sudoku puzzle: (a) original problem and (b)
Techniques: X-Wings - Sudoku Of The Day
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