The Naked Pair is one of the first truly powerful Sudoku techniques you learn after singles. It does not directly place a number at first. Instead, it helps you remove candidates from other cells, which often reveals new Naked Singles and Hidden Singles immediately afterward.
If Naked Singles answer the question “What can go in this cell?”, Naked Pairs answer a more strategic question: “Which two cells are already reserved for the same two numbers?”
💡 Key Concept
A Naked Pair occurs when two cells in the same row, column, or 3×3 box contain exactly the same two candidates — for example {2,7} and {2,7}. Those two numbers must occupy those two cells, so 2 and 7 can be removed from all other cells in that same unit.
🔍 What Makes a Pair “Naked”?
The pair is called naked because the two candidates are visible inside the two cells. Nothing is hidden in the unit. You can literally see that the two cells are limited to the same two options.
Two Cells
The pattern always uses exactly two unsolved cells.
Two Candidates
Each of those cells must contain the exact same two candidates.
One Unit
The cells must share a row, column, or 3×3 box.
Elimination
The pair removes those two candidates from the rest of that unit.
🎯 The Rule
If two cells in the same unit are both limited to the same pair of candidates, those candidates are locked inside those two cells. They cannot appear anywhere else in that row, column, or box.
Interactive Demo: Spot the Naked Pair
This row contains a Naked Pair. Watch how the pair is identified, then see why it controls the rest of the row.
📖 What to Notice
A Naked Pair does not immediately tell you which cell is 2 and which cell is 7. It tells you that both 2 and 7 are reserved for those two cells.
🧠 Why the Logic Works
Imagine two cells in the same row:
Example Row
The two orange cells can only be 2 or 7. Since the row must contain one 2 and one 7, those two cells must take them in some order. Therefore, any other 2 or 7 in the same row is impossible and should be removed.
⚠️ Common Mistake
Do not treat a Naked Pair as two solved cells. You usually do not know which cell is which. The power of the technique is candidate elimination, not immediate placement.
📝 The 4-Step Process
- Scan one unit — choose a row, column, or 3×3 box.
- Find two cells with exactly two candidates each.
- Confirm the candidates match exactly — for example {2,7} and {2,7}.
- Remove those two candidates from every other unsolved cell in that same unit.
Watch: Candidate Elimination
Now we apply the Naked Pair. Notice how the pair itself stays unsolved, but it removes candidates from other cells.
✂️ Elimination Logic
The pair {2,7} reserves those two numbers in the row. Every other 2 or 7 in the same row becomes impossible.
⚖️ Naked Pair vs Hidden Pair
These two techniques sound similar, but they look very different on the grid.
| Aspect | Naked Pair | Hidden Pair |
|---|---|---|
| What you see | Two cells have exactly the same two candidates | Two candidates appear only in the same two cells |
| Main action | Remove the pair numbers from other cells | Remove extra candidates from the pair cells |
| Best tool | Full pencil marks | Careful candidate scanning |
| Difficulty | Early intermediate | Intermediate |
🎯 Remember This
Naked Pair: “These two cells can only be these two numbers.”
Hidden Pair: “These two numbers can only go in these two cells.”
Practice: Find the Pair Yourself
Click the two cells that form the Naked Pair in the highlighted box. Then check your answer.
🎮 Your Goal
A real Naked Pair must have exactly two cells with the exact same two candidates, and both cells must belong to the same row, column, or box.
💡 Pro Tips for Finding Naked Pairs
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Use full pencil marks firstNaked Pairs are much easier to see when all candidates are visible and consistently positioned.
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Scan crowded unitsRows, columns, and boxes with many solved numbers often produce pairs quickly.
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Look for exact twinsThe two cells must match exactly. {2,7} and {2,7,9} are not a Naked Pair.
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Eliminate only inside the shared unitIf the pair is in a row, remove candidates from that row only. If it is in a box, remove from that box only.
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Scan for singles after eliminatingThe best result of a Naked Pair is often a new Naked Single created somewhere nearby.
🌟 Expert Insight
Naked Pairs are a bridge technique. They teach you to stop looking only for immediate answers and start using candidate structure to reshape the puzzle.
🏆 Why Naked Pairs Matter
Naked Pairs are important because they introduce a new style of Sudoku thinking: indirect solving. You are not placing a number immediately; you are reducing uncertainty until the puzzle opens up.
- They unlock harder puzzles where singles alone are not enough.
- They improve candidate discipline because exact notation matters.
- They prepare you for triples and quads, which use the same idea on a larger scale.
- They often create chain reactions after the eliminated candidates reveal singles.
Ready to Practice?
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