Naked Quad
المستوى 5 · Orange Belt
المتطلب السابق: Naked Subsets
Overview
A Naked Quad consists of four cells in a house that together contain exactly four candidates. These four digits must occupy these four cells, allowing elimination from other cells.
How It Works
- Find four cells in a house whose combined candidates total exactly four digits.
- Each cell must contain only subsets of these four candidates.
- Eliminate these four candidates from all other cells in the house.
Example
Check cells r7c4, r8c4, r9c4 and r9c6 in box 8.
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Tips & Patterns
- Naked Quads are uncommon but not as rare as Hidden Quads.
- Look for groups of cells with 2-4 candidates that only use four digits combined.
- Quads are harder to spot visually - use pencilmark highlighting if available.