SuDoKu-Cracker - Help [ Solving Technique: Jellyfish ]


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SuDoKu-Cracker - Jellyfish

We are looking for four rows (or columns) that contain up to four of a particular number in the same relative position. Although Jellyfish are an extension of Swordfish ( X-Wing ).

In the example above, each of the four rows (two, tree, six & seven) have candidate 1 in no more than four cells which share the same for columns (one, four, six & seven). A Jellyfish pattern is established. Other candidate 1's in these four columns (highlighted yellow) can be excluded safely.