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Opening Master Ltd
Mariánska 32/A
Stupava 900 31
Slovak Republic
European Union
Company ID: 48 045 471
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Miscellaneous Information:

The exciting new Opening Master chess database features a unique chess games collection with more than 29 million top human chess games, making it the largest human chess database without duplicates. Experience the power and flexibility of Google No.1 "largest chess database"  to create the ultimate chess winning game. Become a member today and enjoy the biggest chess database package, all carefully selected with more than 20 years of research and development. Download OM OTB with 9 million games, OM CORR with 2 million games, or OM PORTAL with 19 million games.

Contact Info

Opening Master chess databases are copyrighted material. Please refer to our terms and conditions for using the collection. Do not distribute, make illegal copies or parts of the databases. We are not expensive.

Opening Master chess databases are only available as part of the Subscription plans.


+421-917-252-978 (Europe)

+1(888)203-7377 (USA/Canada Toll-Free)

+91 99010 15377 (India)

HQ Address

Mariánska 32/A
Stupava, 900 31, Slovakia


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