Finned Swordfish

Level 8 · Blue Belt

Overview

A Finned Swordfish is a Swordfish pattern with extra candidates forming a fin. Eliminations are limited to cells seeing both the fish and the fin.

How It Works

  1. Find a Swordfish where one row has candidates outside the three columns.
  2. The extra candidates are the fin.
  3. Eliminate only from cells that see both a cover column and the fin's block.

Example

Base rows 1, 4 and 6 form a Swordfish for digit 1 in cover columns 1, 2 and 4.

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Tips & Patterns

  • Finned Swordfish are rare but appear in hard puzzles.
  • The fin must share a block with one of the proper Swordfish cells.