Sudoku technique · First needed at: Fiendish
XYZ-Wing
One of these three cells must hold this number, so nothing seeing all three can.
An example from a real puzzle
- The cells that make the pattern
- Candidates it removes
How to spot it
- Find a pivot cell with three candidates: X, Y and Z.
- Find two cells it sees: one with X and Z, one with Y and Z.
- A cell that sees all three cannot be Z.
Why it works
Whatever the pivot takes, one of the three cells ends up as Z, and a cell seeing all three would clash with it.
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