ReplayChess

ReplayChess is a free, open-source chess platform for the moment every chess video skips: you find the winning move, and then the narrator plays the rest for you. Here you play it out yourself. Pick one of 50+ legends, from Morphy and Capablanca to Kasparov and Carlsen, choose a famous game and start from its critical position. Play it against a friend through a private invite link, a rating-matched opponent with live clocks, or Stockfish running as WebAssembly in your browser at four strengths. When the game ends you get a match rate against the original moves, a marker at the first move where you diverged, and a practice mode to retry the position. An ECO-coded encyclopedia of 3,600+ openings is playable from each resulting position, so club players can drill the middlegames their repertoire actually produces. Tournaments let a group play the same set of positions and compare results. Free to play with no ads; a Player plan at $4.99/month unlocks the full legend and opening catalogue. MIT-licensed on GitHub, built with Next.js 15, React 19, Prisma, Socket.IO and Stockfish WASM, and installable as a PWA.