---
title: "System Examples"
description: "Below are concise examples showing how popular RPG mechanics can be modelled with this notation. Feel free to tweak die sizes or modifiers to suit variant house-rules."
canonical: "https://www.questportal.com/documentation/kDt36fzw6g/system-examples"
section: "Documentation / Dice / Roll Formulas"
source: "Quest Portal documentation"
version: 237
---

# System Examples

Below are concise examples showing how popular RPG mechanics can be modelled with this notation. Feel free to tweak die sizes or modifiers to suit variant house-rules.

### Dungeons & Dragons 5e – Advantage / Disadvantage

- **Normal roll** – \`d20\`
- **Advantage** – \`2d20k1\` _(roll two d20 and keep the higher)_
- **Disadvantage** – \`2d20kl1\` _(keep the lower)_

### Call of Cthulhu 7e – Percentile Skill Checks

Assuming a Skill value of **65**

- **Regular skill check** – \`(d100) \<= 65\` (returns \`1\` on success, \`0\` on failure)
  Alternative counting-success form: \`d100\<65\`
- **Bonus die (Advantage)** – \`min(d%, d%) \<= 65\` (roll two percentile dice, keep the lower tens digit)
- **Penalty die (Disadvantage)** – \`max(d%, d%) \<= 65\`

### Shadowrun-style Dice Pools

- **10-dice pool, hits on 5 +** – \`10d6>5\` (counts the number of 5s and 6s)
- **Exploding sixes (Edge)** – \`10d6!>4\`

### Savage Worlds – Trait & Wild Die

Trait die d8, Wild die d6, both explode, keep the best result:

\`{1d8!, 1d6!}k1\`

### Fate Core

**Skill roll +3** – \`4dF + 3\`

These examples highlight how grouping (\`{}\`), keep/drop (\`k\` / \`kl\`), success targets (\`>\`,\`\<\`), exploding (\`!\`) and comparison expressions combine to recreate many system-specific mechanics.

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Part of the [Quest Portal documentation](https://www.questportal.com/documentation.md) (Documentation / Dice / Roll Formulas). HTML version: <https://www.questportal.com/documentation/kDt36fzw6g/system-examples>.