Absent digits

None of the listed digits appears in the marked cells.

Parameters

Parameter	Meaning	Default
cells	The marked cells, for example r1c1-r1c2.	Required.
digits	The digits that must be absent, for example [2,4].	Required.

Maths

Class: first-order.

The shared predicates define the notation and every named predicate.

excludes(cells,digits)

None of the listed face digits appears in the marked cells. This general authoring-library rule represents absence directly, independently of clue type or shading.

Example

---
format: open-rules
title: Absent digits example
setter: Example
source: ""
case: ""
library: https://rules.sudoku-sleuth.com/
status: read
board:
  rows: 1
  cols: 2
  symbols:
    - 1
    - 2
    - 3
    - 4
---

```rules
absent-digits r1c1-r1c2 digits [2,4]
```

Satisfies the rule: r1c1=1, r1c2=3. Neither 2 nor 4 appears.

Breaks the rule: r1c1=2, r1c2=3. The forbidden digit 2 appears.