Cell Forcing Chains

Expert

Run inference chains from each candidate of a cell; if all reach the same conclusion, it must be true.

How It Works

For each candidate in a cell, run a separate inference chain. If every chain leads to the same conclusion, that conclusion must be true regardless of which candidate is correct in the cell.

The cell-based version of Digit Forcing Chains.

Example

5
29
7
36
4
16
8
19
23
14
63
28
29
17
15
49
15
28
19
45
17
3
16
2
67
6
37
12
158
9
24
47
35
24
39
45
19
27
6
18
25
78
13
78
15
13
35
29
14
6
18
24
26
19
18
5
3
68
47
39
58
46
2
14
16
7
19
14
3
16
47
57
9
24
58
28
Key cells of the techniqueCells where elimination is appliedCandidate to be placedEliminated candidate (crossed out)