This is the description of a hidden (9-n)-tuple (hidden pair, in this case). The cells *not* in the n-tuple are the only ones which can include numbers not in those n candidates. Now describe that situation it another way. This means that these seven cells will contain those seven values in some order. This is a set of seven cells in one set (row, col or box) which between them only have seven different candidates. It's best explained by considering Naked and Hidden n-tuples.Ĭonsider a Naked heptuple. The reason for stopping at 4 is because of the symmetry between possible candidates in a cell and potential sites for a given digit. ![]() As with X-Wing and Swordfish, you can 'Fin' Jellyfish. You are not restricted to rows and colums.ī. I'd avoid those if you can.You can extend all of these in the following ways:Ī. Harder puzzles tend to require a good deal of logic, reasoning, and overall skill. As I continue going through the numbers individually, the puzzle should get progressively easier. Using the process of elimination I try to see where I can place a 1 in consideration to whatever information is given to me at the start of the puzzle. When first looking at the puzzle I usually start with 1s. You should always start with easy puzzles, until you get much better, of course. Once you know how to follow the rules there are easy ways to solve sudoku puzzles.
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