I hope this is helpful, if you have further questions, please ask. My first implementation solved 51 out of 123 of. Exocet takes on three or four candidate sets at a time which is just what is needed in the bottlenecks of extreme puzzles. With few bi-value and bi-location candidates other strategies give up. It should be clear that, for example, f43 is impossible. This step could be presented in a puzzle proof as follows: xwing on 3s at fh59 forbids f48,h463. All possible locations for 3s in row 5 are f5,h5. It focuses on one single digit and its goal is to restrict the number of cells that can have that number as a possible candidate. Note the following: All possible locations for 3s in row 9 are f9,h9. It is a very straightforward technique with an easily identifiable pattern. Obviously 5 is in all rows except maybe in J.Ĭhecking 5 in J: If 5 not in J then J1234=1234, which implies H1 GHJ7=1249ĥ not in GHJ6 => GHJ6 5 in col 6 => 5 in AB6 Exocet is a pattern that can often occur in very hard puzzles where the candidate density is very high. The Sudoku X-Wing strategy is one of the most recurrent techniques that can be applied to Sudoku puzzles from a medium difficulty level onwards. The X-Wing technique is to look for four cells that are aligned (that form an X), and that have the same candidate that does not appear anywhere else in the same row or column. However I'd like to point out setti 5, which you can use after the first 4 solved cells and which is really helpful: I tried to write down all steps for you in detail but it quickly got too much. An X-Wing pattern occurs when two rows (or two columns) each contain only two cells that hold a matching candidate. We solved it without chain and started with a different strategy than Aubinger (whose beginning I find really elegant!). Only the numbers 1 through 9 are allowed to be used. Sudoku is a game that is based on a few simple rules: A single number must appear in each square. A sudoku grid has 81 squares in total, and when the problem is finished, each square will have precisely one number. Lets see which cells can contain the digit 8 in those two rows, they are highlighted in red. Concerning your question about last week's B puzzle is.gd/kst_690_B. The sudoku grid is a 9x9 grid of squares split into 3x3 boxes. Take a look at row number 2 and row number 4 in this puzzle.
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