WXYZ-Wing
Every valid filling of the four cells makes one occurrence of a shared digit true, so that digit goes from outside cells seeing all of its occurrences.
How it works on this board
However the four cells are filled, one occurrence of 9 must be true
3
7
1
8
2
6
7
3
1
9
4
1
8
5
3
6
7
6
4
2
3
4
8
6
6
3
7
8
4
6
8
1
2
5
4
2
8
3
1
3
1
2
6
8
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