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# Solving Techniques 10 XYZ-Wing

The XYZ-Wing is different from XY, in that three numbers are used. It is like the diagram below. When a problem turns out like this, a 3 will be entered somewhere.

If a 3 is entered in A2, then it can’t be in the cells marked X, as shown below.

If a 3 is entered in A5, then it can’t be in the cells marked X, as shown below.

If a 3 is entered in B3, then it can’t be in the cells marked X, as shown below.

As you can see below, in the overlapping areas, X, a 3 can’t be entered.

Below is another XYZ wing, but not using [123] candidates, but rather a combination of three types of candidates, [12][23] and [13].

If a 3 is entered in B3, it can’t be entered in the cells marked X, as shown below.

If a 3 is entered in A5, it can’t be entered in the cells marked X, as shown below.

Hence, in the overlapping areas marked X, a 3 can’t be entered, as shown below. There are more X’s than in the previous example.

The numbers can also be further apart, as shown below. As in the previous examples, 3’s can’t be entered where the X’s are.

They can also be close together, as shown below. In this case, the common number is [1], so 1 can’t be entered in the cells with X’s.

This technique is an application of the XY-wing technique, so it seems to be easy to learn.

## Names of cells in Sudoku

 A1 A2 A3 A4 A5 A6 A7 A8 A9 B1 B2 B3 B4 B5 B6 B7 B8 B9 C1 C2 C3 C4 C5 C6 C7 C8 C9 D1 D2 D3 D4 D5 D6 D7 D8 D9 E1 E2 E3 E4 E5 E6 E7 E8 E9 F1 F2 F3 F4 F5 F6 F7 F8 F9 G1 G2 G3 G4 G5 G6 G7 G8 G9 H1 H2 H3 H4 H5 H6 H7 H8 H9 I1 I2 I3 I4 I5 I6 I7 I8 I9