The OM CORR (short for correspondence) wasn't always a separate chess database until about 10 years ago when the need from correspondence chess players stood out. With 2.2 million games between 1950-2023, it is the ICCF and generally correspondence games best chess database. Mainly used by the correspondence chess players, the OM CORR shows true power when helping the chess masters to analyze their openings or middle game. The ICCF is the largest correspondence chess federation and Opening Master is a proud chess database sponsor. The latest release of OM CORR holds 2,173,050 correspondence chess games.

Five things for each chess player

Whether you are an amateur, beginner, or professional correspondence player you need FIVE things:

1) Your own brain,

2) Powerful multi-core computer with large build in memory, super-fast SSD flash disks,

3) Powerful engine such as Houdini or Stockfish

4) Chess database programs such as Chessbase or Chess Assistant

5) Powerful chess database such as OM OTB or OM CORR.


 “It’s the biggest and strongest chess database out there” - GM Simon Williams, CEO GCHESS


THE OM POSTMAN (History of correspondence chess between 1900 and 1987)

Dear chess lovers and game collectors, it's our pleasure to announce the biggest collection of human correspondence chess games between 1900 and 1987. You will not find a bigger collection of historical correspondence chess players. If we missed some games, we challenge you to let us know. It is the complete history of correspondence chess in the most cleanest and purest form between 1800 and 1987 with 134,024 correspondence chess games.

The OM POSTMAN is part of OM CORR package.


Part of OM CORR is specific OM TOP CORR.CTG. A library, which holds games of top correspondence players with ELO higher than 2300 for the last 5 years. You know better the theory these days evolves fast and furious. If you want to be successful at the correspondence game, you have to try to reach advantage already at the opening. Otherwise, it is proven very difficult to win against a player who also uses strong computer chess programs.

What is better than looking at the openings played by the world's best correspondence chess players. Look if they use your favorite variation or how they are successful with different openings. The library is in format CTG so you can view it with the Chessbase program.

Some interesting facts about the tree:

White most frequent move is 1 e4 with a success rate 55,5%. Right after that is 1 d4 with a success rate of 55%. One of the most frequent opening is variation of Najdorf Sicilian with move 6. H4 with success rate 57,3%. When playing black, a good path to keep up is to play Berlin defense in a Spanish game with white being successful only 52,7%. In closed games, the white gets biggest trauma from playing Slav Defense.

See all details in our new product.

om corr2015

How is Opening Master different from free databases?

Despite getting our games from different sources, we dedicate a lot of time to eliminate duplicates. We also normalize the names of the players, which amounts to dozens or even hundreds of corrections a month. The free databases are often very low-quality and cluttered with lots of duplicates. There is no such thing as free lunch. We ask for a fair price starting 39 EUR for one year. It is much cheaper than less quality commercial chess databases out there.

Have you heard that we prepared a list of the top 52 chess openings for you? They are completely free where and no credit card or sign-up is needed.

Oh.. here is the download link. We almost forgot.

Review in detail our product portfolio View Product Portfolio.

Please be aware this is a subscription based digital content material with regular monthly updates. Please refer to our Terms and Conditions to lean more. If you do not wish to continue with us just cancel the subscription within your PayPal settings or Credit Card provider. You may still keep the copy of the chess databases for infinite number of days but will not receive any future updates.



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The chess databases are important for a number of reasons.

First and foremost, chess databases allow players to study and analyze past games. By studying the strategies and tactics used by top players, aspiring chess players can improve their own skills and understanding of the game. In addition, chess databases can be used to identify patterns and trends in a player's style, which can be helpful in preparing for a match against that player.

Second, chess databases can be used as a training tool. Many chess databases come with built-in analysis and training features that allow players to test their skills and practice specific openings or endgames. This can be particularly useful for players who are looking to improve their tactics or endgame play.

Third, chess databases can be used to track progress and measure improvement. By storing and analyzing a player's games over time, a chess database can help a player identify areas of weakness and track their progress as they work to improve.

Finally, chess databases can be used for research and analysis. Chess enthusiasts and researchers can use chess databases to study the history of the game, analyze the trends and patterns that have emerged over time, and identify the factors that contribute to a player's success.

Overall, chess databases are an invaluable resource for players, trainers, and researchers alike. They provide a wealth of information and tools that can be used to improve one's understanding and skills in the game of chess.


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All our chess databases are stored on external cloud service at This way you have access to the new release immediatelly after we publish it. 

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