Finned Squirmbag
المستوى 11 · Red Belt
المتطلب السابق: Finned & Sashimi Fish
Overview
A Finned Squirmbag is a Squirmbag (5-fish) pattern with extra candidates forming a fin. This is one of the rarest patterns in Sudoku solving.
How It Works
- Find a Squirmbag where one row has candidates outside the five columns.
- These extra cells are the fin.
- Eliminations occur only in cells seeing both the cover columns and the fin.
Example
Base rows 1, 5, 6, 8 and 9 form a Squirmbag for digit 8 in cover columns 2, 6, 7, 8 and 9.
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Tips & Patterns
- Finned Squirmbags are almost never needed in human-solvable puzzles.
- This is primarily of theoretical interest.