Sudoku X Wing Strategy Explained

6 advanced sudoku strategies explained. Y wing example 1. Sudoku guy 15 928 views.

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Sudoku X Wing Technique When And How To Use

Testing the pairs on the grid shows that the 5 highlighted in red would be.

Sudoku x wing strategy explained. This technique merely crosses the possible locations of a candidate in n rows with n columns. Crawler sin bin page you have been banned from this web site because you have been deemed to be a bot or your page requests are hack attempts. How to spot an x wing using rows and then knowing what to do. To prove this technique i prefer to use induction.

A strategy all sudoku experts must know. Sudoku strategies explained with graphics. Sudoku swordfish is a variation of the x wing pattern. Load example or.

With n 4 we have a jellyfish. With n 2 we have a standard x wing. How to identify sudoku x wing. In this example the number 5 forms the necessary pattern to apply the x wing strategy.

The first three are pictured here but you can load the puzzle into the solver to see the remaining examples. From the start i have found a superb tough sudoku puzzle with a sequence of five y wings and this illustrates the full range of this strategy. Your ability to identify and solve this pattern will often break the logjam and lead you to the solution of a challenging sudoku game. With n 3 we have a swordfish.

Read my article solve sudoku for a step by step description on how to reach the place where you apply this technique. Some of these terms except locked candidates and color are explained in my illustrative article sudoku tips. X wing is a strategy in which you find a candidate that appears twice in two different rows and those appearances are both in the same column or the candidate appears twice in two different columns and those appearances are both in the same row. If a particular candidate is present in only two cells in a column and if it is only present in the same rows of another column forming the corners of a rectangle plus cell s of this second column that belong to the same square as one of the corners of the rectangle these extra cells are called the fin then all candidates present in the same.

A sudoku x wing pattern occurs in many of the more difficult sudoku puzzles. In this article i use one of my hand crafted very difficult puzzles that has a known x wing pattern. By connecting the cells containing it it is easy to see that in this situation only the pairs in green or yellow could be possible. With n 5 the creative name squirmbag is used.