If these terms are not familiar, read my article Sudoku Tips for an illustrative guide. An X-Wing pattern occurs when two rows (or two columns) each contain only two cells that hold a matching candidate. This candidate must reside in both rows and share the same two columns or vice versa. In the example shown, an X Wing pattern occurs in row 2 and row 5.
25 rows · Many people have asked me how to solve Sudoku X-Wing, which is a very hard Sudoku.
With many advanced techniques, the key is to spot patterns within your pencil marks to eliminate possibilities within other squares.The x-wing technique:Essentially, this method uses the fact that in certain cases, there are only two possible ways of placing two numbers in four squares which form a rectangle.The Sudoku in Fig. 1 is partially solved using easy and medium difficulty solving.
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can complete the Sudoku using easy methods. In general, an x-wing is found when for two rows, there are two, and only two, possible squares in which a particular number can be placed, and for both rows these squares lie in the same two columns. The Swordfish technique: This is a.
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