Sudoku Tutorial
XYZ wing
versus
XY wing
XYZ wing
XY wing (rectangular)
Compare: Assume candidate Z gets eliminated from target cell(s)
XY wing
Base contains
2
candidates
(XY)
Wings (pincers) are YZ & XZ
The four involved cells (including target) can reside in four separate boxes (rectangular)
Target cell must see both wings but not necessarily see the base
XYZ wing
Base contains
3
candidates
(XYZ)
Wings (pincers) are YZ & XZ
Base must share a box with a wing (never rectangular)
Target cell(s) must see both wings and the base
XY wing (non rectangular)
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