Chess.com
The world's largest online chess platform, offering game play, instructional content, and game analysis powered by the Stockfish engine. It supports PGN format for exporting game records.
Timeline (last 90 days)
Patzer is a self-hosted, open-source alternative to Chess.com that can run on a Raspberry Pi, NAS, or old laptop.
Patzer's game review feature can fetch public games from Chess.com or Lichess, or accept a PGN notation pasted directly by the user.
Both Lichess and Chess.com have built-in free engine analysis powered by Stockfish, which can annotate mistakes, classify error levels, and demonstrate optimal variations.
Chess.com has been reported to have suffered a large-scale user data breach involving the information of approximately 7.3 million users.
Publicly available information is currently limited, and the specific details of the incident, Chess.com's official response, and the full composition of the leaked data have yet to be further confirmed.
Current evidence points more toward data scraping — where attackers use automated means to collect publicly or semi-publicly available user data from the platform at scale — rather than a direct breach of the core database.
Recommended user countermeasures include changing the Chess.com account password and ensuring it is not reused on other platforms, as well as enabling two-factor authentication (2FA).
All Facts (4)
Patzer is a self-hosted, open-source alternative to Chess.com that can run on a Raspberry Pi, NAS, or old laptop.
50%UnverifiedPatzer's game review feature can fetch public games from Chess.com or Lichess, or accept a PGN notation pasted directly by the user.
50%UnverifiedBoth Lichess and Chess.com have built-in free engine analysis powered by Stockfish, which can annotate mistakes, classify error levels, and demonstrate optimal variations.
50%UnverifiedRecommended user countermeasures include changing the Chess.com account password and ensuring it is not reused on other platforms, as well as enabling two-factor authentication (2FA).
50%