RazChess

Game modes

• Normal chess
• Fischer random (chess960)
• Chess puzzles!
  • 220x built-in mate-in-2-steps puzzles
  • External puzzles can be loaded
• Custom game editor to create your own games

Other features

• Share the room/session link with as many people as you want, they can all watch or participate
• Auto reconnect
• Download your game as a GIF
• Encyclopaedia of Chess Openings included
• Copy the FEN or PGN of the current game to use it elsewhere
• Optional persistent storage using Redis, so you can continue your sessions even after restarting razchess

Limitations

• No server side built-in bot (but the standalone bot in tools/bot/ can connect to your session)
• No timer
• No option to ask for a draw
• No built-in chat
• Not designed to be scalable, though it could work with sticky sessions or DNS load balancing
• No built-in TLS/https handling, but you can use razvhost for that

Usage

Usage of razchess:
  -addr string
        Http listen address (default ":8080")
  -logfile string
        Optional path to a log file (still logs to stdout)
  -puzzles string
        Optional location of external puzzles (newline separated list of FEN strings)
  -redis string
        Optional Redis connection string (redis://user:pass@host:port)
  -session-timeout duration
        Session expiration time after all players left (default 1h0m0s)