Unique Loop Strong Link Type
Unique Loop Strong Link Type: 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 two strong links on 9 around the loop, assuming the target 1 makes the loop swappable
2
7
9
1
8
6
5
4
3
4
8
9
5
3
2
7
5
3
7
4
2
4
2
8
5
8
9
3
2
9
2
1
6
3
8
5
2
7
4
6
2
8
3
9
7
5
4
7
9
4
5
6
1
3
2
8
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