XY-Wing
Three two-candidate cells linked as XY, XZ and YZ. Whichever digit XY takes, one end becomes Z, so Z goes from every cell both ends see.
How it works on this board
Either pivot choice makes 3 true in one of the two wings
5
6
2
6
1
8
7
4
5
6
3
8
9
1
7
6
5
8
4
9
7
3
1
7
7
1
4
9
6
4
6
7
7
6
4
2
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