Finned X-Wing Sudoku — Fish Pattern with a Fin

Almost an X-wing for one digit, but one extra candidate—the Fin—changes which eliminations are safe.

How it works

Find the first Row

This Row has a digit 1 appears in exactly two cells.

Find the matching Row

This Row also has 1 in the same Columns, but with one extra cell.

Almost an X-Wing

Four Cells line up across two Rows and two Columns. Just like a normal X-Wing.

Spot the Fin

One Row has an extra 1 candidate, the Fin .

The Fin box

The Fin sits in this . If the Fin is true, 1 must land somewhere in this box on those Columns.

Eliminate in the Fin box

We can safely remove 1 from other cells in the Fin on those Columns.

5
2
4
7
8
4
7
1
9
2
7
8
2
8
1
9
6
3
1
7
9
7
8
9
1
7
9
6
5
7
8
9
3
2
1
5
9
4
1
2
6
9
2
6
9
3
4
2
5
9
1
2
7
1
5
9
8
1
9
3
5
9
1
5
9
7
2
3
8
9
4
1
6
8
9
1
2
8
9
2
6
9
1
4
7
9
4
7
9
6
5
2
8
9
1
2
8
1
4
8
9
3
2
7
9
8
3
4
7
9
2
1
9
3
9
6
1
4
9
1
4
7
9
5
3
1
8
2
6
5
7
4
5
9
4
5
7
9
7
9
2
6
7
9
2
5
6
7
9
5
7
9
8
4
5
7
3
2
5
7
9
1
2
4
6
7
2
4
5
6
7
4
5
7
3
1
9
4
5
6
8
2
4
5
7
8
2
6
7
Find the first Row
This Row has a digit 1 appears in exactly two cells.
5
2
4
7
8
4
7
1
9
2
7
8
2
8
1
9
6
3
1
7
9
7
8
9
1
7
9
6
5
7
8
9
3
2
1
5
9
4
1
2
6
9
2
6
9
3
4
2
5
9
1
2
7
1
5
9
8
1
9
3
5
9
1
5
9
7
2
3
8
9
4
1
6
8
9
1
2
8
9
2
6
9
1
4
7
9
4
7
9
6
5
2
8
9
1
2
8
1
4
8
9
3
2
7
9
8
3
4
7
9
2
1
9
3
9
6
1
4
9
1
4
7
9
5
3
1
8
2
6
5
7
4
5
9
4
5
7
9
7
9
2
6
7
9
2
5
6
7
9
5
7
9
8
4
5
7
3
2
5
7
9
1
2
4
6
7
2
4
5
6
7
4
5
7
3
1
9
4
5
6
8
2
4
5
7
8
2
6
7
Find the matching Row
This Row also has 1 in the same Columns, but with one extra cell.
5
2
4
7
8
4
7
1
9
2
7
8
2
8
1
9
6
3
1
7
9
7
8
9
1
7
9
6
5
7
8
9
3
2
1
5
9
4
1
2
6
9
2
6
9
3
4
2
5
9
1
2
7
1
5
9
8
1
9
3
5
9
1
5
9
7
2
3
8
9
4
1
6
8
9
1
2
8
9
2
6
9
1
4
7
9
4
7
9
6
5
2
8
9
1
2
8
1
4
8
9
3
2
7
9
8
3
4
7
9
2
1
9
3
9
6
1
4
9
1
4
7
9
5
3
1
8
2
6
5
7
4
5
9
4
5
7
9
7
9
2
6
7
9
2
5
6
7
9
5
7
9
8
4
5
7
3
2
5
7
9
1
2
4
6
7
2
4
5
6
7
4
5
7
3
1
9
4
5
6
8
2
4
5
7
8
2
6
7
Almost an X-Wing
Four Cells line up across two Rows and two Columns. Just like a normal X-Wing.
5
2
4
7
8
4
7
1
9
2
7
8
2
8
1
9
6
3
1
7
9
7
8
9
1
7
9
6
5
7
8
9
3
2
1
5
9
4
1
2
6
9
2
6
9
3
4
2
5
9
1
2
7
1
5
9
8
1
9
3
5
9
1
5
9
7
2
3
8
9
4
1
6
8
9
1
2
8
9
2
6
9
1
4
7
9
4
7
9
6
5
2
8
9
1
2
8
1
4
8
9
3
2
7
9
8
3
4
7
9
2
1
9
3
9
6
1
4
9
1
4
7
9
5
3
1
8
2
6
5
7
4
5
9
4
5
7
9
7
9
2
6
7
9
2
5
6
7
9
5
7
9
8
4
5
7
3
2
5
7
9
1
2
4
6
7
2
4
5
6
7
4
5
7
3
1
9
4
5
6
8
2
4
5
7
8
2
6
7
Spot the Fin
One Row has an extra 1 candidate, the Fin .
5
2
4
7
8
4
7
1
9
2
7
8
2
8
1
9
6
3
1
7
9
7
8
9
1
7
9
6
5
7
8
9
3
2
1
5
9
4
1
2
6
9
2
6
9
3
4
2
5
9
1
2
7
1
5
9
8
1
9
3
5
9
1
5
9
7
2
3
8
9
4
1
6
8
9
1
2
8
9
2
6
9
1
4
7
9
4
7
9
6
5
2
8
9
1
2
8
1
4
8
9
3
2
7
9
8
3
4
7
9
2
1
9
3
9
6
1
4
9
1
4
7
9
5
3
1
8
2
6
5
7
4
5
9
4
5
7
9
7
9
2
6
7
9
2
5
6
7
9
5
7
9
8
4
5
7
3
2
5
7
9
1
2
4
6
7
2
4
5
6
7
4
5
7
3
1
9
4
5
6
8
2
4
5
7
8
2
6
7
The Fin box
The Fin sits in this . If the Fin is true, 1 must land somewhere in this box on those Columns.
5
2
4
7
8
4
7
1
9
2
7
8
2
8
1
9
6
3
1
7
9
7
8
9
1
7
9
6
5
7
8
9
3
2
1
5
9
4
1
2
6
9
2
6
9
3
4
2
5
9
1
2
7
1
5
9
8
1
9
3
5
9
1
5
9
7
2
3
8
9
4
1
6
8
9
1
2
8
9
2
6
9
1
4
7
9
4
7
9
6
5
2
8
9
1
2
8
1
4
8
9
3
2
7
9
8
3
4
7
9
2
1
9
3
9
6
1
4
9
1
4
7
9
5
3
1
8
2
6
5
7
4
5
9
4
5
7
9
7
9
2
6
7
9
2
5
6
7
9
5
7
9
8
4
5
7
3
2
5
7
9
1
2
4
6
7
2
4
5
6
7
4
5
7
3
1
9
4
5
6
8
2
4
5
7
8
2
6
7
Eliminate in the Fin box
We can safely remove 1 from other cells in the Fin on those Columns.

All Hints

Unlock hints to find
the Finned X Wing on your board.

Next up

Finned SwordfishHard