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An XYZ-Wing is a very advanced technique which can eliminate certain candidates from squares and is a very similar technique to XY-Wing.

We are looking for three squares. This time the first square contains **XYZ** and we require a buddy of this square to contain **XZ**. We then require another buddy of the **XYZ** square to contain **YZ**.

Any squares that are buddies to **all three squares**, **XYZ**, **XZ** & **YZ** cannot contain **Z**. Why? Because no matter which way around the digits go, the **Z** will be in one of the three squares.

In this Sudoku **X**=7, **Y**=8 & **Z**=9. R4C4 is **XYZ**. R4C2 is **XZ**. R6C4 is **YZ**. So no buddies of all three squares R4C4, R4C2 & R6C4 can contain <9>.

In this Sudoku **X**=6, **Y**=3 & **Z**=2. R8C8 is **XYZ**. R8C2 is **XZ**. R9C8 is **YZ**. So no buddies of all three squares R8C8, R8C2 & R9C8 can contain <2>.

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