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Solving Techniques 14
Jelly-Fish

This refers to a state when, as shown below, there are four columns where only [1] can be entered.

When there is a jelly fish state, [1] can’t be in the other rows, as shown below. It is basically an X-wing or Sword-fish, but with 4 columns.

It is a bit small, but we wrote out all possible combinations of where [1] could be entered below.

This is a variation. As shown below, it appears that an incomplete jelly fish arises at a relatively early stage.

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An example of a jelly fish

In the diagram below, a jelly fish is hidden.

[2] is forming a jelly fish. We made all [2]’s blue. Can you find it?

The fourth column, in the diagram below, is a jelly fish.

Therefore, the [2]’s in the pink cells can be eliminated as candidates.

reference: sudokuwiki.org

Names of cells in Sudoku

A1A2A3A4A5A6A7A8A9
B1B2B3B4B5B6B7B8B9
C1C2C3C4C5C6C7C8C9
D1D2D3D4D5D6D7D8D9
E1E2E3E4E5E6E7E8E9
F1F2F3F4F5F6F7F8F9
G1G2G3G4G5G6G7G8G9
H1H2H3H4H5H6H7H8H9
I1I2I3I4I5I6I7I8I9

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