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Welcome to Opening Master

The exciting new Opening Master chess database features a unique chess games collection with more than 24 millions of 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 10 years of research and development.

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Our most famous chess databases

If you ask us, which is the most favorite product our customers are buying, the clear answer is OM CORRESPONDENCE. All ICCF players love it. The OM OTB is the most powerful Over-the-board chess database ever made and FIDE players analyze it and OM GOLEM - well it's just the biggest one out there.



OM GOLEM is the ICON of all human chess databases. The database is so huge, the strongest computers are needed. It has more than 24 million human games without duplicates. It is a mixture of correspondence, over-the-board and portal games.


The OM CORR wasn't always a separate chess database until about 5 years ago when the need from correspondence players clearly stood out. With 1,7 million games, it is the correspondence best chess database.


The OM OTB with more than 7 million chess games is the biggest over-the-board collection of human chess one could come up with. It all began in 2004 when creators started to collect games and analyze them.


Pay what You really need

All plans come with awesome support by email and phone. There is no hidden fee!

  • OM Basic
  • €28
  • As-is databases, no monthly updates
  • OM OTB, OM CORR, OM PORTAL, OM 2600, 52 Opening reports
  • Formats: PGN
  • Sign Up
  • OM Standard
  • €39
  • As-is databases, no monthly updates
  • OM GOLEM, OM OTB, OM CORR, OM PORTAL, OM 2600, 52 Opening Reports
  • Formats: CB, CA, PGN
  • Sign Up
  • OM Ultimate
  • €59
  • Monthly updates, includes also OM CORR TOP
  • Formats: CB, CA, PGN
  • Sign Up

Download free OM POWER 2500+ to try out our chess databases. No credit card needed! Review in details our product portfolio View Product Portfolio.

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image Modern. Powerful.

About Opening Master

Made in Power

Made in Chess

The Opening Master is the biggest human chess database collection of the world. It has been carefully collected over the past 11 years with focus on quality and quantity. More than 24 million of human chess games

Meet the team.

The founders of Opening Master chess database have been playing chess for more than 30 years each and are recognized international players.

image Alexander Horvath Founder

image Alex Horvath CEO

image Jan Helbich Lead Developer

image Slavka Hulecova Senior Analyst

Flexible & Adaptable chess databases

There are a series of smaller chess databases beyond the large OM GOLEM, to show how flexible the database system is, choose best plan for you and start playing.

Chess Base formats

The most popular chess database software can work with our chess databases

Chess Assistant formats

Those who prefer analysis with Chess Assistant we have formats. Also for SCID users a free PGN formats are supplied.

Why Opening Master

  • It's biggest +

    Yes, we have reached the massive collection of more than 24 million human chess games.
  • It's baddest +

    If you are standard or professional ICCF players, the OM CORR database with 1,2 million
  • Over the board +

    The FIDE collection or OM OTB with more than 7 million games. This is the
  • Top Notch Support +

    Didn't find game you were looking for? Write us. Found a wrong game? Write us.
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What Our Clients Say

  • Great chess databases! Greetings from Portland, Oregon, USA and the Portland Chess Club. Jonathan Ray Fortune (Correspondence Chess Master (CM), United States Chess Federation)
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