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[lichess.org ](https://lichess.org )
==================================
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[](https://travis-ci.org/ornicar/lila)
[](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.org" / >
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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 ),
[computer analysis ](https://lichess.org/ief49lif ) distributed with [fishnet ](https://github.com/niklasf/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/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 [80 languages ](https://crowdin.com/project/lichess ) thanks to the community.
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Lichess is written in [Scala 2.11 ](https://www.scala-lang.org/ ),
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and relies on [Play 2.4 ](https://www.playframework.com/ ) for the routing, templating, and JSON.
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Pure chess logic is contained in [scalachess ](https://github.com/ornicar/scalachess ) submodule.
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The server is fully asynchronous, making heavy use of Scala Futures and [Akka 2 actors ](http://akka.io ).
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Lichess talks to [Stockfish ](http://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 800 million games, which are indexed by [elasticsearch ](http://elasticsearch.org ).
HTTP requests and websocket connections are proxied by [nginx ](http://nginx.org ).
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The web client is written in [TypeScript ](https://typescriptlang.org ) and [snabbdom ](https://github.com/snabbdom/snabbdom ).
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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 [](https://www.browserstack.com).
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Please help us [translate lichess with Crowdin ](https://crowdin.com/project/lichess ).
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[Join us on discord ](https://discord.gg/hy5jqSs ) or in the #lichess freenode IRC channel 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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> If you want to add a live chess section to your website, you are welcome to [embed lichess](https://lichess.org/developers) into your website. It's very easy to do.
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> This project source code is open for other developers to have an example of non-trivial scala/play2/mongodb application. You're welcome to reuse as much code as you want for your projects and to get inspired by the solutions I propose to many common web development problems. But please don't just create a public lichess clone. Instead, [embed lichess using an <iframe>](https://lichess.org/developers) into your website.
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> Also note that while I provide the source code, I do **not** offer support for your lichess instance. I will probably ignore any question about lichess installation and runtime issues.
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## HTTP API
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Feel free to use [lichess API ](https://lichess.org/api ) in your applications and websites.
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Credits
-------
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See the [lichess Thanks page ](https://lichess.org/thanks )
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Supported browsers
------------------
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- [Chrome ](https://www.google.com/chrome ) or [Chromium ](https://www.chromium.org/getting-involved/download-chromium ), 1 year old or newer (fastest local analysis!)
- [Firefox ](https://www.mozilla.org/firefox ), 1 year old or newer (second fastest local analysis!)
- Opera 34 and newer (meh)
- Safari 9 and newer (boo)
- Microsoft Edge (yuck)
- Internet Explorer 11 (eew)
Older browsers will not work. For your own sake, please upgrade.
Security and performance, think about it!
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License
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-------
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Lila is licensed under the GNU Affero General Public License 3 or any later
version at your choice with an exception for Highcharts. See COPYING for
details.
