XYZ-Wing
Fish & Wings16 / 32A three-candidate pivot joins both of its wings.
A Y-Wing where the pivot keeps a copy of the shared digit: the pivot holds {X,Y,Z} and its two wings hold {X,Z} and {Y,Z}. One of these three cells must end up as Z.
Because the pivot itself might be the Z, only cells that see all three pattern cells are affected — a smaller elimination zone than the Y-Wing's, usually inside the pivot's box.
See it in action
Step 1 of 4
The setup
Start from cells with exactly three candidates. Check the bivalue cells they see for two wings whose candidates are both drawn from the pivot's three, overlapping in a single digit. Step through this real position to see it happen.
Practice
Find the XYZ-Wing and remove the shared digit from the cells that see all three pattern cells.
Drill 1 of 29Tap a cell, then the candidate digit you want to remove.