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X-Wing

X-Wing is a technique where you need to spot a rectangle with the following parameters:

  • The single candidate must appear only twice in its two rows or columns;
  • These occurrences are aligned with the other two rows or columns.
  1. To better illustrate this technique, take a look at this example
X-Wing technique illustration
  1. The number 7 in these rows can only be found in the highlighted cells.
X-Wing technique with the marked X
  1. As these rows are guaranteed to contain 7 in one of the highlighted cells, 7 can’t be placed in other cells within the given columns
X-Wing technique applied to a Sudoku grid

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XY-Wing>