Naked Single
المستوى 2 · White Belt (Yellow Stripe)
المتطلب السابق: Naked Subsets
Overview
A Naked Single is the simplest pencilmark technique. When a cell has only one candidate remaining (after all eliminations from its row, column, and block), that candidate must be the solution.
How It Works
- Enable pencilmarks to see all candidates for each cell.
- Look for any cell that has only one candidate remaining.
- That candidate is the solution for the cell.
Example
Check cell r4c4 and examine its candidates.
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Tips & Patterns
- Pencilmarks are essential for spotting Naked Singles.
- After placing any digit, check its row, column, and block for new Naked Singles.
- In easy puzzles, Naked Singles can chain together quickly.