The case notes
Discover which rule a line follows
This line follows one of two rules. It could be Renban, a consecutive set, or Nabner, with no consecutive pair at all. Watch a worked example, then try the idea in a puzzle.
Put it into practice
Renban or Nabner?
This line follows one of two rules. It could be Renban, a consecutive set, or Nabner, with no consecutive pair at all.
1 and 2 rule out Nabner
One and two are both on the line. They are consecutive. That breaks Nabner immediately, even though they sit beside each other here.
The line is Renban · {1, 2, 3, 4}
So this line must be Renban. Four cells need four consecutive digits. With one, two and three already present, the set has to be one through four.
r1c4 = 4
The last line cell must be four. The important first step was finding which of the two rules this particular line obeys.
Read the transcript
This line follows one of two rules. It could be Renban, a consecutive set, or Nabner, with no consecutive pair at all. One and two are both on the line. They are consecutive. That breaks Nabner immediately, even though they sit beside each other here. So this line must be Renban. Four cells need four consecutive digits. With one, two and three already present, the set has to be one through four. The last line cell must be four. The important first step was finding which of the two rules this particular line obeys.
