Avoidable Rectangle Type 2
A rectangle half-made from digits you placed, whose remaining corners carry the same spare digit. It goes from every cell both corners see.
How it works on this board
To avoid a second solution, the extra 2 must occupy at least one open corner
7
8
4
9
1
3
5
1
4
7
9
1
4
9
8
7
9
6
3
4
1
5
8
1
3
9
4
2
4
5
9
8
8
6
4
9
5
4
6
5
9
8
1
9
7
2
8
6
4
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