RocketSudoku.com

Finned Swordfish

Hard

Almost a Swordfish for one digit, but one extra candidate—the Fin—changes which eliminations are safe.

How it works

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Find the first Column

This Column has a — digit 8 appears in two cells.

4
1
5
7
1
5
6
7
1
3
5
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1
3
6
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7
3
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9
3
1
5
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4
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8
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6
7
1
4
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6
7
1
6
7
9
1
2
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7
9
1
3
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6
9
3
4
6
7
9
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7
1
3
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5
2
8
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4
7
9
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3
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1
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2

Find another matching Column

This Column also lines up — but it already has an extra 8 candidate.

4
1
5
7
1
5
6
7
1
3
5
7
1
3
6
3
6
7
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6
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2
9
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1
5
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8
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6
7
1
4
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6
7
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6
7
9
1
2
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3
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8
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Find the third matching Column

This Column lines up too — all three Columns share the same Rows.

4
1
5
7
1
5
6
7
1
3
5
7
1
3
6
3
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1
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8
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6
7
1
4
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6
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6
7
9
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2
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3
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3
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7
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4
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3
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2
8
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3
4
7
9
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3
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2

Almost a Swordfish

Six cells line up across three Columns and three Rows — just like a normal Swordfish.

4
1
5
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2

Spot the Fin

One Column has an extra 8 candidate, the Fin . That extra cell stops this from being a full Swordfish.

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The Fin box

The Fin sits in this . If the Fin is true, 8 must land somewhere in this box on those Rows.

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2

Eliminate in the Fin box

We can safely remove 8 from other cells in the Fin on those Rows.

All Hints

Unlock hints to find
the Finned Swordfish on your board.

Next up

Finned JellyfishHard