Finned X-Wing / Finned Swordfish
Extreme
Used by Smart Hint
An almost-fish pattern with one or more extra "fin" candidates confined to a single box — eliminations still hold, just narrowed to that box.
- First colour in the chain
- Cells that establish the pattern
- Where the conclusion lands
- Candidate ruled out
How it works
- Digit 4's candidates in row 1 fall in columns B and E — a normal X-Wing shape — except row 2 also carries an extra 4 at E2, the "fin," confined to the same box as E1.
- Either the fin at E2 is 4 (then the box already accounts for column E's 4, so nothing elsewhere in that box's rows can be 4), or it isn't (then the plain X-Wing applies as usual) — both cases agree D2 can be eliminated, since it shares the fin's box and lies in a cover column.
- Sashimi Finned Fish are the same idea with a base corner left empty instead of carrying an extra candidate.