Alternating Inference Chain (AIC)
The general chain: strong and weak links alternating, free to move between digits and cells, with the two ends forcing the conclusion.
How it works on this board
At least one end of the chain must be true
5
3
2
9
6
7
5
2
2
4
6
5
5
8
7
2
1
6
3
7
9
1
7
3
1
6
4
1
6
3
4
5
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