The Sudoku X-Wing strategy is one of the most frequent techniques that can be applied to Sudoku puzzles from a medium difficulty level onwards. It is a very straightforward technique with an easily identifiable pattern.

Sudoku Strategy. X-Wings are the simplest of the chaining formations and are very easy to spot. They use four cells in a rectangle to make eliminations in the row or column.

X Wings occur when two rows or two columns contain the same number only twice and in the same location. It gets its name from how the 4 cells form an X. When you find one, you know that the number involved has to appear in two of the four cells.

An X Wing is a Sudoku solving technique that lets you reduce the number of candidates in particular columns or rows of the grid. While X Wings aren’t always required to solve Sudoku puzzles, knowing what they are and how to use them will help speed up your solves.

An X Wing is a technique for removing candidates (pencil marks). It starts with either two parallel rows or two parallel columns. Blocks are not involved here.

The X-wing is an advanced sudoku technique used to solve sudoku puzzles. See how to use the X-wing sudoku strategy with examples and practice puzzles.

Let's look at a real-life example of how to solve Sudoku using the X-Wing method. As you can see in the picture, there are two rows with cells that have the same number—a four. The Sudoku rules say that you have to repeat a number once in a horizontal and vertical line.

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. This common candidate is called the fish digit. We saw earlier an example …

X-Wings are when there are two lines, each having the same two positions for a number. Take a look at this puzzle: Once you've satisfied yourself that there aren't any easy methods you can apply to move forward, take a look at the candidate positions for 6, in rows 4 and 9.

X-Wing - an advanced Sudoku solving technique. Principles explained and illustrated with examples.