Grouped XY-Chain
A chain of two-candidate cells with groups of cells mixed in as nodes.
How it works on this board
At least one end of the chain must be true
7
2
1
4
5
9
1
1
8
5
1
6
3
1
3
5
8
3
9
1
7
6
8
3
1
1
9
6
6
1
5
8
2
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