Doubly Linked ALS-XZ Rule
Two Almost Locked Sets joined by two shared digits. The double link also clears candidates inside the sets themselves.
How it works on this board
Two ALSs are joined by two restricted common candidates
9
2
5
1
4
7
8
2
6
2
5
1
9
4
8
3
5
2
7
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2
6
9
3
7
6
7
2
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