Aligned Quadruple Exclusion
Work through every combination of digits for four cells that all see each other, and remove the candidates no combination allows.
How it works on this board
Every assignment of the aligned cells that includes the target repeats a digit or leaves a common peer with no candidate
3
4
1
2
6
1
2
4
2
4
5
2
4
7
6
2
4
5
1
2
1
6
4
8
2
4
8
2
1
5
6
2
5
8
3
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