ReplayChess

ReplayChess turns chess history into something you play instead of watch. Pick a famous game from 50+ legends (Morphy, Fischer, Kasparov, Carlsen and more) or any of 3,600+ ECO-coded openings, start from the critical position, and play it out for real against a friend, a rated opponent or Stockfish running in your browser at four strengths. Afterwards a divergence report shows your match rate against the original moves and the first move where you left the grandmaster's line, with a practice mode to retry the position. Built for club and online players in the 800-2000 range, coaches who want to hand a student a specific position, and developers curious about a working real-time multiplayer app. Rating-based matchmaking, time controls, private challenge links that a friend can open without an account, tournaments, and a PWA that installs on phones and desktops. Free to play with no ads; a Player plan ($4.99/month) unlocks the full legend and opening catalogue. MIT-licensed on GitHub, built with Next.js 15, React 19, Prisma on PostgreSQL, Socket.IO and Stockfish WASM.

ReplayChess allows users to relive and play critical moments from legendary chess games. It provides a platform to challenge friends by sharing unique game positions and comparing their moves against top chess engines. The tool enhances learning and engagement with chess by turning video moments into playable challenges. Users start by choosing a critical chess position from legendary games. They can then share a challenge link with friends to play from that position. After playing, they can compare their moves to the best engine line to learn and improve their game. ReplayChess is designed for casual players and learners who want to explore legendary chess moments. It caters to users looking to practice their skills through interactive and engaging challenges against friends and chess engines.