X-Wing
A digit's candidates in two rows sit in the same two columns, so the digit goes from the rest of those columns.
How it works on this board
In each base house, 8 is confined to the same number of cover houses
5
1
8
4
4
9
9
1
7
4
4
8
6
7
2
9
4
6
4
5
4
3
2
4
1
4
1
8
5
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