Discontinuous Nice Loop
A loop that fails to join at exactly one point. The candidate at that join leads to a contradiction, so it goes.
How it works on this board
If the target 4 were true, the chain would make both ends of their strong link false, a contradiction
2
7
5
4
9
6
2
3
9
6
2
9
2
5
1
6
2
8
3
2
2
8
4
5
2
8
9
6
9
1
8
2
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