XYZ-Wing

A three-candidate pivot and two wings share a removable digit.

Learn the XYZ-Wing Sudoku technique: a pivot of three candidates plus two wings let you remove a digit from cells that see all three.

How to use it

1. Find the pivot. Find a cell with exactly three candidates, x, y and z — the pivot of the wing.
2. Find the two wings. Find two cells the pivot sees, one with candidates x and z, the other with y and z. Each is a subset of the pivot sharing z.
3. Eliminate the shared digit. One of the pivot or wings must be z, so remove z from every cell that sees all three.