LEVEL 6
X-Wing
A digit appears in exactly two aligned cells across two rows or columns.
How to find it
- Choose a candidate digit and scan rows.
- Find two rows where it occurs in the same two columns.
- Eliminate the digit from other cells in those columns.
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
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.