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In this example:
An XYZ wing consists of:
- A base (or pivot) where candidates XYZ are all
present
- 2 bivalue cells (wings or pincers) visible to the
base that contain XZ and YZ only.
- 1 or more target cells that are visible to all three
cells and contains candidate Z
Consider the base cell (blue). If it is not a 1, it will force
one of the wings to be a 1.
One of the three cells must contain a 1. Any cell visible to all
three colored cells cannot contain a 1. The 1 in r2c3 can be
eliminated. (cell r2c1 would also be another target cell if it
were not already solved).
Click here for a comparison between XY wings and XYZ wings
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