81 lines
4.7 KiB
Markdown
81 lines
4.7 KiB
Markdown
# [lichess.org](https://lichess.org)
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[](https://github.com/ornicar/lila/actions?query=workflow%3A%22Build+server%22)
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[](https://github.com/ornicar/lila/actions?query=workflow%3A%22Build+assets%22)
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[](https://crowdin.com/project/lichess)
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[](https://twitter.com/lichess)
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<img src="https://raw.githubusercontent.com/ornicar/lila/master/public/images/home-bicolor.png" alt="Lichess homepage" title="Lichess comes with light and dark theme, this screenshot shows both." />
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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.
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It features a [search engine](https://lichess.org/games/search),
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[computer analysis](https://lichess.org/ief49lif) distributed with [fishnet](https://github.com/niklasf/fishnet),
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[tournaments](https://lichess.org/tournament),
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[simuls](https://lichess.org/simul),
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[forums](https://lichess.org/forum),
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[teams](https://lichess.org/team),
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[tactic trainer](https://lichess.org/training),
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a [mobile app](https://lichess.org/mobile),
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and a [shared analysis board](https://lichess.org/study).
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The UI is available in more than [130 languages](https://crowdin.com/project/lichess) thanks to the community.
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Lichess is written in [Scala 2.13](https://www.scala-lang.org/),
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and relies on the [Play 2.8](https://www.playframework.com/) framework.
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[scalatags](https://com-lihaoyi.github.io/scalatags/) is used for templating.
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Pure chess logic is contained in the [scalachess](https://github.com/ornicar/scalachess) submodule.
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The server is fully asynchronous, making heavy use of Scala Futures and [Akka streams](https://akka.io).
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WebSocket connections are handled by a [separate server](https://github.com/ornicar/lila-ws) that communicates using [redis](https://redis.io/).
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Lichess talks to [Stockfish](https://stockfishchess.org/) deployed in an [AI cluster](https://github.com/niklasf/fishnet) of donated servers.
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It uses [MongoDB](https://mongodb.org) to store more than 1.7 billion games, which are indexed by [elasticsearch](https://github.com/elastic/elasticsearch).
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HTTP requests and WebSocket connections can be proxied by [nginx](https://nginx.org).
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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.
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The [blog](https://lichess.org/blog) uses a free open content plan from [prismic.io](https://prismic.io).
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All rated games are published in a [free PGN database](https://database.lichess.org).
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Browser testing done with [Browserstack](https://www.browserstack.com).
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Proxy detection done with [IP2Proxy database](https://www.ip2location.com/database/ip2proxy).
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Please help us [translate Lichess with Crowdin](https://crowdin.com/project/lichess).
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See [lichess.org/source](https://lichess.org/source) for a list of repositories.
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[Join us on Discord](https://discord.gg/lichess) for more info.
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Use [GitHub issues](https://github.com/ornicar/lila/issues) for bug reports and feature requests.
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## Installation
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```
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./lila # thin wrapper around sbt
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run
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```
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The Wiki describes [how to setup a development environment](https://github.com/ornicar/lila/wiki/Lichess-Development-Onboarding).
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## HTTP API
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Feel free to use the [Lichess API](https://lichess.org/api) in your applications and websites.
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## Supported browsers
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| Name | Version | Notes |
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| ----------------- | ------- | ------------------------------------------------- |
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| Chromium / Chrome | last 10 | Full support |
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| Firefox | 61+ | Full support (fastest local analysis since FF 79) |
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| Opera | 55+ | Reasonable support |
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| Safari | 11.1+ | Reasonable support |
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| Edge | 17+ | Reasonable support |
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Older browsers (including any version of Internet Explorer) will not work.
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For your own sake, please upgrade. Security and performance, think about it!
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## License
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Lila is licensed under the GNU Affero General Public License 3 or any later
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version at your choice with an exception for Highcharts. See [copying](https://github.com/ornicar/lila/blob/master/COPYING.md) for
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details.
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## Credits
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See [lichess.org/thanks](https://lichess.org/thanks) and the contributors here:
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[](https://github.com/ornicar/lila/graphs/contributors)
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