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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 Take a look at this puzzle: Sudoku puzzle. And the 4 in box 2 uses up all the places in A4 and A6. You should be able to solve the remaining empty cells. Here is the next step you need to do to solve the X-Wing pattern. We have a 4 in G3 which occupies the space in A3.Likewise the 4 in F7 removes A7 as a placement for 4. We have now arrived at the X-Wing pattern shown in the graphic. The arrangement of 4s on this board suggests something in the first row, row A. However I'd like to point out setti 5, which you can use after the first 4 solved cells and which is really helpful: X-Wings are when there are two lines, each having the same two positions for a number. Last number in a row When you have scanned the boxes for obvious solutions, check the rows and columns. Once you identify the x-wing, scan the cells, columns, and rows of the two wings and eliminate any candidates that would invalidate one of your wings. The use of this strategy usually results in the unveiling of the solution of one or several cells. It is considered as basic due to the clarity of the fish pattern required for its application and its recurrence. I tried to write down all steps for you in detail but it quickly got too much. The X-Wing technique is to look for four aligned cells that form an X, and that have the same candidate that does not appear anywhere else in the same row or column. The Sudoku Swordfish strategy is a basic advanced technique applied in the hardest levels of these puzzles to eliminate candidates. It gets its name from how the 4 cells form an X. We solved it without chain and started with a different strategy than Aubinger (whose beginning I find really elegant!). X Wings occur when two rows or two columns contain the same number only twice and in the same location. Concerning your question about last week's B puzzle is.gd/kst_690_B.