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Pure chess logic is contained in [scalachess](https://github.com/ornicar/scalachess) submodule.
The codebase is fully asynchronous, making heavy use of Scala Futures and [Akka 2 actors](http://akka.io).
Lichess talks to [Stockfish](http://stockfishchess.org/) deployed in an AI cluster of donated servers.
It uses [MongoDB 3.2](https://mongodb.org) to store more than 350 million games, which are indexed by [elasticsearch](http://elasticsearch.org).
It uses [MongoDB 3.4](https://mongodb.org) to store more than 400 million games, which are indexed by [elasticsearch](http://elasticsearch.org).
HTTP requests and websocket connections are proxied by [nginx 1.8](http://nginx.org).
Client-side is written in [mithril.js](http://mithril.js.org/).
The [blog](https://lichess.org/blog) uses a free open content plan from [prismic.io](https://prismic.io).