Hard

XYZ-Wing

What it is

Like Y-Wing, but the pivot has three candidates, so only cells that see all three cells are affected.

Find a pivot with XYZ that sees a cell with XZ and a cell with YZ. One of the three cells must be Z.

The pivot r1c1 (1 2 3) sees r1c5 (1 3) and r2c2 (2 3). One of the three is always 3, so 3 is removed from r1c3, which sees all of them.

Used from level: Hard