Incomplete WXYZ-Wing
Incomplete WXYZ-Wing: Branches through cells with few candidates, ruling out candidates incompatible with every branch.
How it works on this board
However the four cells are filled, one occurrence of 1 must be true
6
4
3
6
9
5
4
7
2
4
5
7
3
4
8
4
9
1
8
2
7
5
1
3
9
2
4
3
5
9
2
5
7
No marks yetPosition 0 / 2