Techniques / Wings
XYZ-Wing
Like an XY-Wing but the pivot has three candidates {X,Y,Z}.
The pivot holds {X,Y,Z}, one pincer {X,Z} and the other {Y,Z}, and both pincers see the pivot. Whatever the pivot is (X, Y or Z), at least one of the three cells holds Z.
So Z can be removed from every cell that sees all three cells.
Notation
XYZ-Wing: 5 can be removed from r9c9.
pattern fin / link removed
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