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Jellyfish

This technique is a bit more complex version of a Swordfish. This time, you need to spot 4 candidates on each side of the rectangle

  1. Take a look at the columns in this example
Jellyfish technique initial example
  1. Here you can see that number 9 in these columns can only be found in the highlighted cells
Jelly fish technique with highlighted candidates
  1. This means that the other cells in the same rows can’t contain the number 9.
Results of applying Jellyfish Sudoku technique

< Swordfish

Naked Quad>