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.
Logical demonstration
The violet cells represent the pattern; the gold cell represents the resulting placement or elimination. Verify every highlighted candidate belongs to the required houses before acting.
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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.
GUIDED PRACTICE · EXERCISE 1 OF 3
Finned X-Wing training
Identify the logically justified next action. Violet cells form the pattern and the gold cell is the proposed result.
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