Claiming
When a digit's candidates in a row or column sit inside one box, they can go from the rest of that box.
How it works on this board
Within the line, 9 is confined to one box
1
2
9
8
6
4
7
3
5
7
6
8
1
5
3
4
3
4
5
7
2
9
6
1
8
1
1
4
2
7
3
9
1
3
5
8
6
8
2
5
5
3
6
9
8
1
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