Lila (lichess.org)

Lila is the open source chess server that powers lichess.org, providing fast real-time gameplay and a full set of chess tools in a web interface. It combines play, training, analysis, and community features with a large-scale game database and public API.

Key Features

• Real-time chess gameplay with matchmaking and rated modes
• Tournaments and simultaneous exhibitions (simuls)
• Puzzle and tactics training features
• Computer analysis powered by Stockfish via the Fishnet distributed system
• Shared analysis boards and studies for collaborative review
• Community features including teams and forums
• Game search and indexing over a very large game database
• HTTP API for integrating lichess features into other apps

Use Cases

• Host a full-featured chess platform for a community, club, or organization
• Provide analysis, study, and training tools for players and coaches
• Build third-party tooling and integrations using the public API

Limitations and Considerations

• Full production deployments can be complex due to multiple components (web app, WebSocket server, search, database, analysis cluster)
• Some advanced features (e.g., large-scale engine analysis) require significant compute resources

Lila is a mature, high-traffic chess server with a broad feature set and an API-first mindset. It is well suited for organizations that want an end-to-end chess platform with strong real-time performance, analysis tooling, and community features.