Avoidable Rectangle 2D
Avoidable Rectangle 2D: 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 ALS-XZ constraint, assuming the target makes the pattern swappable
7
5
3
3
5
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7
7
3
5
9
4
8
1
9
5
4
3
6
7
2
6
7
9
5
3
5
3
7
9
2
1
5
7
3
8
5
7
3
8
1
3
9
1
7
5
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