Avoidable Rectangle Hidden Single
Avoidable Rectangle Hidden Single: Because the puzzle has exactly one solution, any pattern that would give two can be ruled out.
How it works on this board
Following the hidden single constraint, assuming the target makes the pattern swappable
2
9
2
9
1
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6
4
8
6
3
9
4
9
1
5
1
7
9
5
6
3
9
1
4
3
1
9
1
2
9
4
9
6
3
4
7
1
8
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