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Sudoku Strategy

Sudoku Strategies for Beginners and Advanced Players

A strategy guide covering scanning, naked singles, hidden singles, locked candidates, pairs, and when to move from easy Sudoku to harder puzzles.

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Key Takeaways

  • Scanning, naked singles, and hidden singles are the foundation for most Sudoku solving.
  • Locked candidates, pairs, and triples become more useful as puzzle difficulty increases.
  • X-Wing, Swordfish, coloring, and chains are advanced tools for resistant puzzles.

What is the best Sudoku strategy for beginners?

The best beginner strategy is scanning for missing numbers, then finding naked singles and hidden singles.

Which Sudoku strategies help with harder puzzles?

Harder puzzles usually require candidate tracking, locked candidates, pairs, triples, and pattern recognition.

Beginner Strategy Stack

Start with row, column, and box scanning. Then identify naked singles and hidden singles before writing many candidates.

This stack keeps the board readable and reduces accidental contradictions.

Intermediate Techniques

Locked candidates help when a number inside a 3x3 box can only sit in one row or column.

Pairs and triples become useful when two or three cells share the same candidate set in a row, column, or box.

Advanced Pattern Work

X-Wing and Swordfish patterns look for the same candidate lining up across rows and columns.

Coloring and chain ideas can solve very difficult puzzles, but they require careful notation.