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XYZ-Wing

This is an extension of the XY-Wing, but now it contains not only X and Y candidates, but Z as well.

  1. Consider these cells
XYZ-Wing technique example
  1. One of these three highlighted cells must contain the value 2
Highlighted candidates in XYZ-Wing technique
  1. That means the value 2 can’t be placed in any cell that sees all three highlighted cells at the same time
XYZ-Wing implementation result

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WXYZ-Wing>