Grouped Discontinuous Nice Loop
A loop with grouped nodes that fails to join at one point. The candidate at that join goes.
How it works on this board
If the target 1 were true, the chain would make both ends of their strong link false, a contradiction
8
4
7
6
9
8
5
5
3
9
6
8
1
5
4
7
4
7
8
6
5
4
7
3
6
8
4
8
9
1
2
8
4
2
7
6
1
4
No marks yetPosition 0 / 2