Technique

Jellyfish

Swordfish stretched to four lines: a digit confined, across four rows, to the same four columns overall - rare, but the same logic as X-Wing and Swordfish, just bigger.

💡 What It Is

A four-line fish pattern - the same idea as X-Wing and Swordfish, one size up.

🔍 How To Spot It

Pick a digit. Find four rows where every candidate for it falls within the same four columns overall.

✅ Why It Works

Across those four rows, the digit has to use up exactly those four columns between them - so no other cell in those columns can hold it.

📝 Worked Example

Digit 8's candidates in rows 2, 3, 6, and 8 fall only within columns 1, 4, 6, and 7. Eliminate 8 from every other cell in those four columns.

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