XY-Chain
A chain running through two-candidate cells only. Both ends carry the same digit, so it goes from every cell they both see.
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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