X-Chain
One digit only, with strong and weak links alternating along the chain. The digit goes from every cell both ends see.
How it works on this board
At least one end of the chain must be true
7
8
5
9
2
3
9
2
3
7
5
8
2
3
8
7
5
9
8
2
3
9
7
5
3
2
7
8
4
7
8
1
2
3
3
5
9
7
8
2
2
4
3
8
5
7
7
8
2
3
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