LEVEL 7
Finned X-Wing
An almost X-Wing with one extra candidate produces local eliminations.
How to find it
- Find an X-Wing pattern with one extra fin in the same box.
- Identify the cover line affected by the fin.
- Eliminate only from cells that see the fin and the opposite corner.
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
Finned X-Wing training
Loading a mathematically verified puzzle state…
Continue through the fish family
Fish techniques use the same base-line and cover-line idea at different sizes. Follow the sequence to understand exactly what changes before attempting a harder pattern.