Unique Rectangle Type 2
Two corners of the rectangle carry the same spare digit. One of them must take it, so it goes from every cell both corners see.
How it works on this board
To avoid a second solution, the extra 5 must be true in at least one roof cell
4
9
3
8
6
1
7
8
9
3
4
3
7
1
8
1
4
6
7
1
9
4
1
6
2
9
7
3
4
7
4
6
5
1
3
2
8
9
3
7
1
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