35
Techniques · Medium
Claiming
The mirror image of Pointing. If, inside one row or column, all the places for a digit lie in a single box, the line's copy of the digit lands in that box. So the digit cannot go in the other cells of the box.
How to spot it
Read each row and column for a digit whose candidates sit in one box only. Remove the digit from the other six cells of that box.
Example
7
1235
1236
346
2346
9
68
58
6
39
8
39
7
5
2
1
4
59
4
125
1269
69
8
56
3
7
2
1
67
5
8
469
467
69
3
34589
35689
3567
2369
3469
23469
14678
689
18
3489
3689
36
369
1
7
468
5
2
1
2
356
7
3569
369
58
4
589
58
58
9
4
2
1
3
7
6
7
356
4
8
3569
369
15
2
159
In row 8, 5 is confined to box 7, so 5 can be removed from the rest of box 7 (Claiming).
the pattern cells that lose a candidate (crossed out)