Free, open-source platform for probabilistic chess.
Dice Chess is chess where three dice decide which piece types may move on each turn, and the game ends by capturing the king — no checks, no checkmate, pure calculated risk. Fortemate is the open home of this game family: free to play, no ads, no registration required.
🎲 Play now · 📖 How to play · 🤖 Build a bot
- Provably fair dice. Every roll uses server CSPRNG wrapped in commit–reveal: the commitment is published before the game, the seed is revealed after, and any finished game can be verified independently. No trust required.
- Open Bot API. Register your own bot over a simple webhook or polling protocol, climb the public Glicko-2 ladder, and play against humans. Starter kits available in Java, Python, and TypeScript.
- Skill vs. luck, measured. A game with dice deserves analytics that separate what you played from what you rolled — that is where this platform is headed.
| Repository | What it is |
|---|---|
| dicechess-bot-java | Java 25 baseline house bot and reference starter template |
| dicechess-engine-scala | The rules engine: Scala 3, cross-compiled to JVM and Scala.js/WASM, with a Java-facing API |
| dicechess-play | The web app: SvelteKit PWA, playable offline against local bots |
| dicechess-play-api | Server-authoritative game backend: WebSockets, ratings, Bot API |
| dicechess-bot-python · dicechess-bot-typescript | MIT starter kits for bot developers |
More repositories are moving into this organization as part of the ongoing brand migration.
Contributions are welcome — see the contributing guide in each repository. The platform repositories are AGPL-3.0 and require a one-time CLA signature with your first pull request; the starter kits are MIT and require nothing. Found a security issue? See our security policy.
