Lichess/lila
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update games number - database.lichess.org only shows *rated* games

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Thibault Duplessis
2026-04-27 10:03:31 +02:00
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.github/copilot-instructions.md
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## Repository Overview
Lila (li[chess in sca]la) is the free, open-source chess server powering lichess.org - one of the world's largest chess platforms with 7+ billion games. This is a production-scale application serving millions of users with real-time gameplay, computer analysis, tournaments, and comprehensive chess features.
Lila (li[chess in sca]la) is the free, open-source chess server powering lichess.org - one of the world's largest chess platforms with 12+ billion games. This is a production-scale application serving millions of users with real-time gameplay, computer analysis, tournaments, and comprehensive chess features.
**Technology Stack:**
README.md
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The UI is available in more than [140 languages](https://crowdin.com/project/lichess) thanks to the community.
Lichess is written in [Scala 3](https://www.scala-lang.org/),
and relies on the [Play 2.8](https://www.playframework.com/) framework.
and relies on a modified [Play 2.8](https://www.playframework.com/) framework.
[scalatags](https://com-lihaoyi.github.io/scalatags/) is used for templating.
Pure chess logic is contained in the [scalachess](https://github.com/lichess-org/scalachess) submodule.
The server is fully asynchronous, making heavy use of Scala Futures and [Akka streams](https://akka.io).
WebSocket connections are handled by a [separate server](https://github.com/lichess-org/lila-ws) that communicates using [redis](https://redis.io/).
Lichess talks to [Stockfish](https://stockfishchess.org/) deployed in an [AI cluster](https://github.com/lichess-org/fishnet) of donated servers.
It uses [MongoDB](https://www.mongodb.com) to store more than 7 billion games, which are indexed by [elasticsearch](https://github.com/elastic/elasticsearch).
It uses [MongoDB](https://www.mongodb.com) to store more than 12 billion games, which are indexed by [elasticsearch](https://github.com/elastic/elasticsearch).
HTTP requests and WebSocket connections can be proxied by [nginx](https://nginx.org).
The web client is written in [TypeScript](https://www.typescriptlang.org/) and [snabbdom](https://github.com/snabbdom/snabbdom), using [Sass](https://sass-lang.com/) to generate CSS.
All rated games are published in a [free PGN database](https://database.lichess.org).