Swordfish
Level 6 · Orange Belt (Green Stripe)
Prerequisite: Basic FishLearn next → X-WingLearn next → Finned SwordfishLearn next → Franken SwordfishLearn next → Jellyfish
Overview
Swordfish extends X-Wing to three rows and three columns. When a candidate appears 2-3 times in each of three rows, and all occurrences fall within the same three columns, eliminations can be made.
How It Works
- Find three rows where a candidate appears in at most 3 cells each, all within the same 3 columns.
- The candidate must appear at least once in each row and column of the pattern.
- Eliminate the candidate from other cells in those three columns.
Example
Base rows: 1, 4 and 9. Check where digit 5 can appear in those rows.
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Tips & Patterns
- Swordfish requires careful tracking of candidate positions.
- Look for candidates that are restricted to few columns across multiple rows.
- Pencilmark highlighting greatly helps in spotting this pattern.