Cell Forcing Chains
Try each candidate of one cell in turn, follow the chain from each, and keep only what every branch agrees on.
How it works on this board
Every candidate chosen in the target cell makes 5 false
9
6
7
1
8
4
2
1
7
6
9
5
8
1
3
2
9
8
4
6
7
5
6
1
2
4
3
1
6
9
No marks yetPosition 0 / 2