Fat Ring
Fat Ring: Candidates that close into a loop rule out what lies inside or outside it.
How it works on this board
The highlighted candidates are locked into a ring of one row, one column and their boxes
7
1
8
4
9
9
3
1
6
4
1
1
7
9
3
6
2
1
7
4
8
9
5
9
8
6
3
1
7
3
9
5
6
8
1
5
6
7
2
2
7
6
9
5
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