LEVEL 6
Empty Rectangle
A box pattern and an external strong link force an elimination.
How to find it
- Find a candidate forming row-and-column arms inside a box.
- Locate a strong link outside the box.
- Follow the intersection to remove the candidate from the shared peer.
Candidate-map demonstration
The violet cells mark the pattern and the gold cell marks the resulting placement or elimination. Treat this compact map as orientation; use the verified full puzzle below to practise the actual deduction.
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Common mistakes
- Using cells that do not share the required row, column, box or peer relationship.
- Removing a candidate before confirming every occurrence in the pattern.
- Confusing a possible pattern with a completed logical proof.
VERIFIED PRACTICE
Empty Rectangle training
Loading a mathematically verified puzzle state…