Lichess
Lichess is the most complete chess experience, with a simple interface that focuses on the game, a massive array of game related tools and a huge, worldwide community.
The Lichess covenant: lichess.org will always be free. lichess.org will never contain advertisements. lichess.org will always be open source.
FEATURES Two-player games between humans Single-player games (versus Stockfish, the most powerful open-source engine) Spectator mode Premoves Support for moretime() Resignation and draw offers Ability to abort uninitiated games Ability to force resignation 'Arena' style tournament feature
Customization Time controls for chess clocks, including Fischer delay Optional Black and White player randomization Ability to request a player to take back a move Support for variants: Chess960, King of the Hill, Three-check Chess, Atomic chess, Antichess, Horde chess User-defined restriction of who can join games, based on player rating Board editor to set up and practice positions against players or people.
Learning Opening puzzles to learn good continuations Tactics puzzles Coordinate trainer to train the locating of chess squares Curated library of publicly available chess videos PGN import and ability to load positions from FEN
Technology Mobile app for iOS and Android Works in any modern web browser (except Internet Explorer 8 and lesser versions), with no plugins such as Flash or Java needed Availability in over 80 languages Ability to toggle the overall theme of the website between black and white Basic chess set and background theme switching Ability to invite friends to a game via unique links created for every game Optional username and password registration Option for users to close their accounts
