Jellyfish

المستوى 8 · Blue Belt

المتطلب السابق: Basic Fish

Overview

Jellyfish is the four-row, four-column extension of fish patterns. When a candidate in four rows is restricted to the same four columns, it can be eliminated from other cells in those columns.

How It Works

Find four rows where a candidate appears, with all occurrences in the same four columns.
Each row must have 2-4 occurrences of the candidate within these columns.
Eliminate the candidate from other cells in those four columns.

Example

Base columns: 6, 7, 8 and 9. Check where digit 7 can appear in those columns.

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Tips & Patterns

Jellyfish are quite rare - master X-Wing and Swordfish first.
Computer assistance is helpful for finding Jellyfish reliably.
The pattern may not use all 16 intersection cells.