ChessDB.cn is the living, breathing megabrain of online chess—powered by thousands of CPUs running Stockfish, the full 7-piece Syzygy DTZ50 tablebases, TCEC tournament feeds, and continuous user-contributed analysis.
Here's why ChessDB is even better than carrying a chess supercomputer in your pocket:
pgn2cdb to upgrade eval lines.Traditionally, grandmasters and top engines guided chess improvement. ChessDB eclipses both with vast computational power, delivering move quality unmatched by human or typical engine analysis.
A single position at depth-50 takes many minutes on a strong PC. ChessDB has precomputed billions of positions, equivalent to hundreds of millennia!
No waiting for engines—ChessDB serves deep results in milliseconds, letting you focus on strategy.
ChessDB regularly ingests full PGN dumps from Top Chess Engine Championship (TCEC)—including high-quality status games like Division P, League 1, Superfinal, and more—via pgn2cdb, upgrading or replacing entries with deeper, more accurate analysis.
Insights from deeper child positions flow upward, improving evaluation accuracy and stability.
If a novel position isn't yet in the database, ChessDB seamlessly falls back to Stockfish for real-time analysis.
Direct REST API endpoints and standard UCI commands make embedding ChessDB’s power into your tools effortless.
Pure computational analysis, free from human bias, forms the ultimate opening guide.
Even the rarest openings are covered, with nearly a million lines hand-curated for completeness and accuracy.