ALS Chain
Almost Locked Sets joined one after another by shared digits. Whatever both ends of the chain see can be cleared.
How it works on this board
The ALSs connect in sequence through restricted common candidates
3
9
8
6
4
4
7
1
6
3
2
9
5
5
7
2
1
7
2
7
9
5
3
3
1
8
2
9
7
4
8
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