Close Whispers
Neighbouring digits along the line differ by at most the stated maximum.
Parameters
| Parameter | Meaning | Default |
|---|---|---|
| line | The cells in order, for example r1c1-r1c2-r1c3. | Required. |
| gap | The greatest difference allowed between neighbours. | Required. |
Maths
Class: first-order.
The shared predicates define the notation and every named predicate.
∀i ∈ [0,|line|−1): |D(line[i])−D(line[i+1])| ≤ gap
Neighbouring path positions differ in digit by at most gap.
Example
---
format: open-rules
title: Close Whispers example
setter: Example
source: ""
case: ""
library: https://rules.sudoku-sleuth.com/
status: read
---
```rules
sudoku 9x9
close-whispers r1c1-r1c2 gap 2
```
Satisfies the rule: r1c1=1, r1c2=3. The neighbours differ by the permitted maximum 2.
Breaks the rule: r1c1=1, r1c2=4. The neighbours differ by 3, exceeding the maximum 2.