The board we open first
Lichess
Lichess tops our ranking because nothing on it is held back. Every puzzle, every analysis line, every variant and every tournament sits there for the same price as a cup of tap water.
Non-profit and open sourceNo adverts, no paid tierEight variants beyond standard chess
It began in 2010 as one French programmer’s project and now runs as a non-profit, funded by donations rather than advertising. That shows in the details. Click play, choose a clock and an opponent appears almost before you have settled into the chair. When the game ends, a Stockfish-powered analysis board waits to show you exactly where the evening turned. Studies let you annotate lines with friends, and Chess960 is a button away when the Sicilian starts to feel stale.