All techniques
Finned Swordfish
Fish & Wings20 / 32A Swordfish with a fin — eliminations shrink to one box.
The same idea one size up: a Swordfish that would be perfect if not for one or two extra candidates in a single base row, tucked into one box.
Case analysis saves the day again: fin false — clean Swordfish; fin true — the digit is in the fin's box. Only eliminations inside the fin's box hold in both worlds.
See it in action
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Step 1 of 4
The setup
Near-miss Swordfish patterns are the trigger: three rows whose columns almost merge into three, spoiled by strays in one box of one row. Step through this real position to see it happen.
Practice
Find the finned Swordfish and clear its digit from the covered cells inside the fin's box.
Drill 1 of 29Tap a cell, then the candidate digit you want to remove.