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📋 Naked Pairs – Sudoku Technique

When two cells in a unit share the same two candidates, remove them from the other cells. Illustrated guide with common mistakes and tips.

What Are Naked Pairs?

A naked pair occurs when exactly two cells in a row/column/box contain the same two candidates (e.g., {2,7}). Those candidates can be removed from all other cells in that unit.

Step-by-Step Example

Step 1: Candidate-2 pattern in the column
1) Scan shows a pattern of candidate 2 in the highlighted column.
Step 2: Two cells share the same two candidates
2) Two cells are restricted to the same two digits ⇒ a naked pair.
Step 3: Eliminate from the other cells in the unit
3) Eliminate those digits from the other cells; new placements may follow.

Where It Works

  • Any row,
  • Any column,
  • Any 3×3 box.

Common Mistakes

  • Not verifying there are exactly two cells with those two candidates.
  • Mixing units—the pair must be within the same row/column/box.

Tips

  • Clear singles and do basic scans first; naked pairs then pop out.
  • Once spotted, immediately clear those candidates within the unit.
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