Sudoku FlowSudoku technique lessons / XYZ-Wing
Lesson 20
XYZ-Wing
The rule
At least one of a pivot and its two wings must hold their shared number, so any cell that sees all three loses that candidate.
Step by step
- The pivot cell has exactly three candidates 2, 8 and 5, and it sees two bivalue wings: one with 2 and 5, the other with 8 and 5. This forms an XYZ-Wing!
- Since at least one of the three cells must be 5, we can remove the candidate 5 from any other cell that sees all three.
Try it on more boards
Each board is a real puzzle from our app, at a moment where XYZ-Wing applies. Find the step yourself, or tap Hint and the app's own hint walks you through it.
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