Lila
# [lichess.org](https://lichess.org) [](https://crowdin.com/project/lichess) [](https://mastodon.online/@lichess) [](https://bsky.app/profile/lichess.org) [](https://discord.gg/lichess) [](https://deepwiki.com/lichess-org/lila) <img src="https://raw.githubusercontent.com/lichess-org/lila/master/public/images/home-bicolor.png" alt="Lichess homepage" title="Lichess comes with light and dark theme, this screenshot shows both." /> Lila (li[chess in sca]la) is a free online chess game server focused on [realtime](https://lichess.org/games) gameplay and ease of use. It features a [search engine](https://lichess.org/games/search), [computer analysis](https://lichess.org/ief49lif) distributed with [fishnet](https://github.com/lichess-org/fishnet), [tournaments](https://lichess.org/tournament), [simuls](https://lichess.org/simul), [forums](https://lichess.org/forum), [teams](https://lichess.org/team), [tactic trainer](https://lichess.org/training), a [mobile app](https://lichess.org/app), and a [shared analysis board](https://lichess.org/study). 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 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 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). Browser testing done with [Browserstack](https://www.browserstack.com). Proxy detection done with [IP2Proxy database](https://www.ip2location.com/database/ip2proxy). Please help us [translate Lichess with Crowdin](https://crowdin.com/project/lichess). See [lichess.org/source](https://lichess.org/source) for a list of repositories. [Join us on Discord](https://discord.gg/lichess) for more info. Use [GitHub issues](https://github.com/lichess-org/lila/issues) for bug reports and feature requests. ## Installation ``` ./lila.sh # thin wrapper around sbt run ``` The Wiki describes [how to setup a development environment](https://github.com/lichess-org/lila/wiki/Lichess-Development-Onboarding). ## HTTP API Feel free to use the [Lichess API](https://lichess.org/api) in your applications and websites. ## Supported browsers | Name | Version | Notes | | ----------------- | ------- | -------------------------- | | Firefox | 115+ | Full support (recommended) | | Chromium / Chrome | 112+ | Full support | | Edge | 109+ | Full support | | Opera | 91+ | Reasonable support | | Safari | 13.1+ | Reasonable support | Older browsers will not work. For your own sake, please upgrade. Security and performance, think about it! ## License Lila is licensed under the GNU Affero General Public License 3 or any later version at your choice. See [copying](https://github.com/lichess-org/lila/blob/master/COPYING.md) for details. ## Production architecture (as of July 2022)  ## Credits See [lichess.org/thanks](https://lichess.org/thanks) and the contributors here: [](https://github.com/lichess-org/lila/graphs/contributors) ## Competence development program Lichess would like to support its contributors in their competence development by covering costs of relevant training materials and activities. This is a small way to further empower contributors who have given their time to Lichess and to enable or improve additional contributions to Lichess in the future. For more information, including how to apply, check [Competence Development for Lichess contributors](https://lichess.org/page/competence-development).