Broken Wing
Strong links in one digit close into a loop of odd length, which cannot stand. One of the guardians breaking the loop must be true, so whatever they all see can be cleared.
How it works on this board
At least one guardian of the odd 2-loop must be true
4
8
1
1
6
4
7
8
3
5
8
7
2
1
4
4
8
7
6
3
5
7
9
7
1
9
3
8
3
7
7
5
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