The OM OTB

The OM OTB with 8,9 million chess games is the biggest over-the-board played games collection one could come up with. It all began in 2004 when creators started to collect games and analyze them into a single chess database. The origin of the name "OM OTB" dates back to October 2011 when OM XXL was split between OM OTB and OM CORR. The chess database was cleaned of all correspondence and portal games and left only pure human over-the-board chess games. Some GM chess players consider this database as the strongest available. We update the chess database regularly and usually increase by 100K games per month. During this time we clean the shop, index the files, correct names, in other words, make it better than the versions before.

Almost 9 million human chess games

The OM OTB comes with almost 9 million chess games. Precisely 8,955,647 human chess games ever played over the past century until November 2020. This is the largest and most clean chess database found on the Internet. And the price remains the same as last year at 59 EUR. Within this price, you get approx 3-4 updates per year. Since the last period, we added more than 200K games.

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.

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Chess database Selection

Database name
OTB
GAMBIT
POST
Number of games
1,975,876
9,016,294
29,822,427
781,189
134,024
Formats supported
cbv, pgn
cbv, pgn
cbv, pgn
Chessbase
Chessbase
Last Update
01/2021
01/2021
01/2021
11/2020
11/2020
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