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Chess Database - Pay what You really need

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

  • OM Basic
  • €28 / year
  • As-is chess databases, no monthly updates
  • OM OTB, OM CORR, OM 2500, OM TOP CORR, 52 Opening reports
  • Formats: PGN only
  • Sign Up
  • OM Standard
  • €39 / year
  • As-is chess databases, no monthly updates
  • OM GOLEM, OM OTB, OM CORR, OM PORTAL, OM 2500, 52 Opening Reports
  • Formats: Chessbase only
  • Sign Up
  • OM Ultimate
  • €59 / year
  • 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.

The Opening Master Chess Databases since 2004

The Opening Master chess databases feature a unique chess games collection with more than 26 millions of top human chess games, making it the most significant 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 14 years of research and development. Subscribe to our annual programs starting as low as 28 EUR / year.

Chess database Matrix

Database name
OM CORR 2300
Type of Subscription
Number of games
Last update performed
Apr 19, 2016
Sept 27, 2015
Oct 19, 2015
Jan 30, 2017
Oct 7, 2017
April 25, 2017
July 6, 2017
Jan 30, 2017
April 24, 2018
June 2, 2018
April 1, 2018
April 28, 2015
Update Frequency
  • All
  • Announcements
  • Federations
  • General
  • Holidays
  • Newcomers Corner
  • Openings
  • Default
  • Title
  • Date
  • Random
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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 CORR. All ICCF players love it. The OM OTB is the most powerful Over-the-board chess database ever made, and many FIDE GM players use 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 massive that the most robust computers are needed. It has more than 26 million human games without duplicates. It is a mixture of correspondence, OTB, and portal games.


The OM CORR wasn't always a separate chess database until about seven years ago when the need from correspondence players stood out. With 1,8 million games, it is the correspondence best chess database suited mostly for ICCF players.


The OM OTB with more than 8 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. A must package for all FIDE players.


Privacy Policy

Data protection statement and Privacy Policy

We, the Opening Master Ltd, Slovakia, welcome your interest in our website and chess database products. Protecting your private life is very important to us. Below, we inform you in detail how we deal with your data.

We take very seriously the protection of your personal data and the way we handle it confidentially. What we do with your personal data is done exclusively in accordance with the legal framework imposed by the data protection law of the European Union, specifically the General Data Protection Regulation (hereinafter “GDPR”) and subsequent applicable regulations.

This data protection statement informs you how we make use of your personal data on our website at www.openingmaster.com and about your rights under the GDPR.

Article 1.

Name and contact data of the firm to which the statement refers

This data protection statement refers to data processing by: Opening Master s.r.o (hereinafter “Opening Master”, “we”), residing Bernolakova 1A, Malacky 90101, Slovak Republic, Email: This email address is being protected from spambots. You need JavaScript enabled to view it., Telephone +421 917 252 978

Article 2.

Processing of personal data

In what follows we inform you about the processing of your personal data whenever you make use of our website simply as a visitor. Information about the processing of your personal data when you make use of what is on offer on our website as a user of the Opening Master online shop can be found below under sub-heading III of this data protection statement. Information about the processing of your personal data as far as further services of Opening Master - can be found below under sub-heading IV of this data protection statement.

1. The object of data protection

The object of data protection consists of “personal data”. This is all the information which refers to an identified or identifiable private person (so-called affected person). This includes e.g. information such as name, postal address, e-mail address or telephone number, but also information such as your OpeningMaster user profile name or data linked to it.

Specific information about the personal data processed by us can be found below in the detailed data processing operations.

2. Collection and storing of personal data and the type and purpose of processing

a. Visiting the website

Whenever you log into our website or leave a comment on it, the IP address of the computer you connected with is temporarily stored in a so-called logfile. The said data is then over-written with fresh data collected the next time you log in or leave a comment.

The legal basis for the data processing is Art. 6 (1) f) DGPR. Our legitimate interest follows from the fact that we are able to recognize any improper use and where appropriate prevent it. On no account will we make use of the data collected for the purpose of drawing conclusions about you as a person.

In addition, when you visit our website we employ cookies and analysis services. You will receive more detailed explanations about this under numbers 4 and 6 of this data protection statement.

b. Receiving a newsletter

Insofar as according to Art. 6 (1)  a) DGPR you have specifically given your consent, we use your e-mail address in order to regularly send you our newsletter. In order to receive the newsletter it is sufficient to have given us your e-mail address, e.g. by buying our product and registering and subscribing to our services and accepting terms and conditions. We cannot process your request without a valid email address.

If you purchase goods or services on our internet site and in doing so leave your e-mail address this can subsequently be used by us in order to send a newsletter. In such a case we will send with the newsletter exclusively direct advertising for our own goods or services. The legal basis for the sending of the newsletter following the purchase of goods or services is in this case  § 7  (3) UWG together with Art. 6 (1)  f) DGPR.

You may withdraw consent at any time no matter whether the sending of the newsletter was based on your specific consent or on legally permissible grounds, for example via a link at the end of one newsletter or another. Alternatively you can at any time send us your withdrawal of consent to This email address is being protected from spambots. You need JavaScript enabled to view it. by e-mail. There are no costs involved other than the costs of transmission according to base tariffs.

The data required for the sending of the newsletter are deleted as soon as they are no longer required for the purpose for which they were collected and insofar as no other legal basis requires further processing. Your e-mail address is then stored for the distribution of the newsletters until you withdraw your consent or no longer wish to receive the newsletter.

c. Using our contact form and e-mail contact

For questions of any sort we offer you the option of contacting us via a contact form made available on our website. To do so you are required to use a valid e-mail address, so that we know from whom the request comes in order to be able to answer it. Further information can be added if you so wish.

Alternatively it is possible to make contact via the e-mail address which is provided. In this case your personal data which you have provided with the e-mail will be stored.

Data processing for the purpose of making contact comes under Art. 6 (1)  f) DGPR. If the goal of making contact is the conclusion of a contract, then the additional legal basis for the processing of the data is Art. 6 (1)  b) DGPR.

The personal data which we collect is deleted after the question you brought up has been dealt with.

3. Disclosure of data

We will only pass on your data to third parties if the data protection regulations allow this. In this sense, we are allowed to disclose your personal data to a third party if this processing is required in order to fulfil a contract with you of for the carrying out of pre-contractual measures, which stem from your request, e.g. passing on your address to a carrier (Art. 6 (1) b) DGPR).

Furthermore, we work together with providers of services, so-called contract workers, who process your data for us and directed by us as described in Art. 28 DGPR (e.g. in evaluating the use of our website via Google Analytics, cf. Number 5). These service providers are carefully selected and contracted by us; they are bound to our instructions and regularly vetted.

4. Cookies

We employ cookies on our website. These are small files which are automatically created by your browser and which are stored on your device (laptop, tablet, smartphone, etc.), whenever you visit our website. Cookies in no way damage your device, do not accept viruses, trojans or other malicious software.

The cookie stores information which is generated on each occasion linked to the device which is actually in use. This does not mean, however, that we receive from them any direct knowledge of your identity.

On one hand, employing cookies serves to make access to what we are offering more pleasant for you. Thus we install so-called session cookies in order to recognize that you have already visited individual pages on our website. These are automatically deleted when you leave our website.

Over and above that we also make use of temporary cookies in order to make things as user-friendly as possible; these are stored on your device for a pre-determined length of time. If you revisit our website in order to avail yourself of our services, it is automatically recognized that you have already been on the site and which inputs and settings you have used so that you do not have to enter them again.

On the other hand we employ cookies for a statistical analysis to evaluate the use of our website and for the purpose of optimizing our offer to you (see Number 5).

The data processed by cookies are required for the purposes named to protect our legitimate interests and those of third parties according to Art. 6 (1)  f) DGPR.

Most browsers accept cookies automatically. You can, however, configure your browser in such a way that no cookies are stored on your computer or that a warning is given before a new cookie is saved. Complete deactivation of cookies, however, can lead to you not being able to use all the functions on our website.

5. Analysis by Google Analytics

The tracking measures we have installed have been done on the basis of Art. 6 (1) f) DGPR. With the tracking measures being applied, we want to ensure needs-based design and on-going optimization of our website. On the other hand, we employ the tracking measures to evaluate statistically the use of our website and for the purpose of optimizing what we are offering you. These interests are justified in the sense of the aforementioned regulations.

For the purposes of making our website user-friendly and continually optimizing it we make use of Google Analytics, a web analysis service of Google Inc. (https://www.google.en/intl/en/about/) (1600 Amphitheatre Parkway, Mountain View, CA 94043, USA; hereinafter “Google”). In this connection pseudo user profiles are created and  cookies (see under Number 4) used. The information derived from the cookie about your use of the website such as

  • browser type/version,
  • operating system used,
  • referrer URL (the website described above),
  • host name of the computer accessing the site (IP address),
  • time of logging on to the server,

is transmitted to Google’s server in the USA and stored there in accordance with the agreement we have with Google concerning the data in the contract. The information is used to evaluate the use of the website and to produce reports on the website activities and to provide further services linked to the use of the website and the internet for the purposes of market research and rendering the web pages user friendly. This information is also when appropriate passed on to a third party insofar as this is legally required or insofar as the third party has a contract to work on this data. In no case is your IP-address linked to other data by Google. The IP addresses are anonymized, so that no attribution is possible (IP masking). Sessions and campaigns are ended after a specified length of time. The standard time at which to end a session is after 30 minutes with no activity and for campaigns it is six months. The time limit for can go to a maximum of two years.

You can prevent the installation of cookies through an appropriate setting of your browser software; we would, however, point out that in such a case it is possible that not all functions of this website can be used to their full potential.

Moreover, you can prevent the recording of the data generated via the cookie of your use of the website (including your IP address) as well as the handling of this data by Google by downloading and installing a  browser add-on (https://tools.google.com/dlpage/gaoptout?hl=en).

6. Online Marketing

Within the online shop on our website (for more details see under Number III) we also employ tools for the continual optimization of our online marketing. These measures which we include are there for the protection of our legitimate interest on the basis of Art. 6 (1) f) GDPR.

a. Google AdWords

We employ the "AdWords" procedure of Google in order to place adverts in Google’s advertising network in such a way that they are displayed to users who are potentially interested in our adverts. In this case when they are accessed on our and other websites on which Google’s advertising network is active, a code is executed by Google and so-called marketing tags (also known as web beacons) are attached. With their help, an individual cookie is stored on your device (instead of cookies alternative technologies can also be used). This notes which websites you have visited, and which contents interested you or which pages you clicked on; furthermore, technical information and other details are stored for further use. Moreover, an individual “conversion cookie” is installed. The information obtained with the help of this is used by Google to establish conversion statistics for us. We only learn, however, the anonymous total number of users who have clicked on our advert and who have been transferred onwards to a page which has a marketing tag attached to it. The users‘ data are processed under a pseudonym within Google’s advertising network, unless they have chosen some other setting. The information collected is transmitted to Google and saved on their servers in the USA. You will find further information as to the use of the data by Google and options regarding settings and objections as well as the settings for the display of adverts under  https://policies.google.com/technologies/ads or https://adssettings.google.com/authenticated.

b. Google Retargeting  

We use Google’s retargeting technologies. This makes it possible to send to users of our website in a targeted fashion advertising linked to their interests such as they have already shown for our website and our products. The display of adverts follows on from a  cookie-based analysis of the previous behavior of the user, but no personal data is stored during this process. In the retargeting a cookie is installed on your device in order to collect anonymized data concerning your interests. This means that you are shown adverts which are most probably more related to the products which interest you. You can prevent the storing of cookies for the purpose of retargeting by installing the following plugin: https://www.google.com/settings/ads/onweb/. You can find further information about the data processing connected with retargeting by Google under http://www.google.com/policies/technologies/ads/.

7. Data security

When you visit the website we make use of the common SSL process (Secure Socket Layer) in connection with the highest level of encoding which is supported by your browser. In general this involves a 256 Bit encoding. If your browser does not support 256 Bit encoding, we will instead revert to 128 Bit v3 technology. You can recognize whether an individual website of ours on the net is encoded by the by the representation of a closed key or padlock symbol in the bottom status bar of your browser.

Moreover, we make use of appropriate technical and organizational security measures in order to protect your data against random or intentional manipulation, partial or complete loss, destruction or unauthorized access by third parties. Our security measures are continuously being improved according to technological developments.

Article 3.

How we use the personal data of users of the Opening Master membership program

If you use the Opening Master membership program (hereinafter “Opening Master Members” or “Shop”) the following supplementary information is in force.

1. Opening Master user account

In order to acquire goods and/or services via the shop, you have to log in with your Opening Master user account. If you do not have such a Opening Master user account, you will be asked to set up a new Opening Master user account. With your Opening Master user account accessible via your e-mail address and the password you have chosen, you have at any time access to your previous orders and control over your personal data for the processing of orders.

To set up a Opening Master user account you have to enter into the input box the user profile name you wish, your e-mail address and the password you wish to use.

Our justification for the use of the data for the management of the Opening Master user account, and which you input pursuant to an order, derives from Art. 6 (1)  b) GDPR, since the use of the data is required in order to fulfill the contract requested.

If you wish, we will delete the Opening Master user account. Until then we will store the relevant data without limit of time so that you can at any time have access to it. When a Opening Master user account is deleted after the processing of an order (expiration of the warranty period) we lock the data referring to specific purchases and delete it after expiration of the warranty period. 

We also process the purchase history associated with your Opening Master user account. This processing is justified by reference to Art. 6 (1)  f)  GDPR and serves our justified interest in always improving what we offer an offering you suitable products from the Opening Master Shop.

2. Payment data, delivery address and billing address

When acquiring services in the Opening Master Shop you are required to choose a way to pay and let either us or the company which guarantees your payments have the relevant payment data. Our payment services are outsourced to PayPal Inc since 2007. All necessary payment information submitted to PayPal is stored and analyzed by PayPal Inc according to their GDPR following.

Our justification for the use of your payment data, delivery address and billing address for the settlement of your purchase, and which you input pursuant to an order, derives from Art. 6 (1)  b) GDPR, since the use of the data is required in order to fulfill the contract requested.

Article 4.

Your rights

1. Some points on mandatory information

According to Art. 13 (2) e) GDPR we advise you that the provision of your personal data is neither legally nor contractually required. Insofar as its provision is necessary for the fulfilling of a contract, this is made clear during the ordering process in compulsory fields. Moreover, you are not obliged to provide us with personal data. Not doing so will have no negative consequences for you, apart from the fact that it may not be possible to fulfill the order you desired. We do not process your personal data for the purposes of some automated decision making.

2. Rights of the data subject

You have the right:

  • According to Art. 15 GDPR to obtain information about personal data of yours processed by us. Specifically, you can obtain information concerning the purposes of the processing, the category of personal data concerned, the categories of recipient to whom the personal data have been or will be disclosed, the envisaged period for which the personal data will be stored, the existence of the right to request rectification or erasure of personal data or restriction of processing of personal data, the right to lodge a complaint, where the personal data are not collected from the data subject, any available information as to their source, the existence of automated decision-making, including profiling, and meaningful information about their details;
  • According to Art. 16 GDPR the right to obtain without undue delay the rectification of inaccurate or incomplete personal data we have stored and which concerns you;
  • According to Art. 17 GDPR the right to obtain the erasure of personal data concerning you, so long as the processing is not required for exercising the right of freedom of expression and information, for compliance with a legal obligation, for the performance of a task carried out in the public interest or for the establishment, exercise or defense of legal claims;
  • According to Art. 18 GDPR the right to obtain restriction of processing your personal data when the accuracy of the personal data is being contested by you, the processing is unlawful and you oppose the erasure of the personal data and we no longer need the data but you require it for the establishment, exercise or defense of legal claims or according to Art. 21 DSGVO you have raised an objection to its processing;
  • According to Art. 20 GDPR the right to receive the personal data you have provided to us in a structured, commonly used and machine-readable format and to transmit those data to another data controller;
  • According to Art. 7  (3)  GDPR the right to withdraw your consent at any time. This has as a consequence that for the future we may no longer continue to process the data for which this consent was given and
  • According to Art. 77 GDPR the right to lodge a complaint with a supervisory authority, As a rule this may be that of your habitual residence, place of work or the headquarters of our firm.

3. The right to object

Insofar as your personal data is being processed on the basis of legitimate interests according to Art. 6 (1)  f) GDPR, you have the right according to  Art. 21 GDPR to raise an objection against the processing of your personal data, if there are grounds for it which result from your particular situation or if the objection is directed against direct marketing. In the latter case you have a general right to object, which will be implemented by us without specification of a special situation.

Article 5.

Validity and changes to this data protection statement

This data protection statement is at present in force and dates from May 25 2018.

The further development of our website and offers on it or altered legal or official requirements can make it necessary to make changes to this data protection statement. You can access and print out the data protection statement in force at any time at https://www.openingmaster.com/privacy-policy

Thank you for registration



Dear chess friend, 

we thank you for your recent registration and subscription. Please allow us few hours to set up your cloud folder access. You will be notified within today with separate email from the cloud where you can access all chess databases. 

If you have any questions or shall you have any registration issues, please contact us at This email address is being protected from spambots. You need JavaScript enabled to view it.

Best regards, 

Opening Master Management Team


Terms of Service

Opening Master has a number of regulations by which its members are expected to abide. Please familiarize yourself with our Terms of Service policy before you open your Opening Master account. Check the checkbox in the "Terms of Service" section by clicking in it only if you understand and agree to observe our rules. If you attempt to submit this form without checking this box, you will be returned to the form and prompted to check it.

Terms of Service

OPENING MASTER s.r.o (or OPENINGMASTER CO, OPENINGMASTER LTD). is the owner and operator of OPENINGMASTER.COM, an online chess community. Registered members of Opening Master can submit online chess games in database readable format and upload files to various sections of the website.


OPENINGMASTER, CO. reserves the right to modify any part of this Agreement at any time in its sole discretion; this includes but is not limited to the graphic file storage term, and any Opening Master functionality. Any modification is effective immediately upon posting on this page. If any modification to this Agreement is unacceptable to you, you may immediately terminate the Services by closing your account. However, if you do not terminate the Services, or continue to use the Services following modification to this Agreement, your continued use will mean that you have accepted that modification. We will notify about any changes in the Opening Master Announcement section in Forum

Acceptable Use

Your use of the services provided by Opening Master is subject to the following agreement. Violations of this agreement may result in termination of your account with or without notice. Opening Master recommends that members maintain their own backups of any 'irreplaceable' content, as Opening Master cannot warrant that no loss or corruption of data shall occur.

Age Requirements

Use of Opening Master is limited to persons at least 13 years of age. Nobody under the age of 13 is allowed and no information of any person under the age of 13 will be knowingly collected by Opening Master. If you become aware of any person under the age of 13 who uses Opening Master, please contact us at This email address is being protected from spambots. You need JavaScript enabled to view it. to report such occurrences. Opening Master will immediately delete any information of and/or any accounts that we believe to belong to users under the age of 13.


Purchase is available to anyone who provides all required information including your name, and an accurate and legitimate email address and credit card information.
The fees are non-refundable and we do not refund charges for unused services.

Prohibited Use

You may not use Opening Master (1) in any manner that violates any law, regulation, treaty or tariff or infringes on the legal rights of any third party, (2) in any manner which is defamatory, fraudulent, indecent, offensive or deceptive, (3) to threaten, harass, abuse or intimidate others, (4) to damage the name or reputation of Opening Master, OPENINGMASTER, CO., its affiliates, or subsidiaries, (5) to break security on any computer network, or to access an account that does not belong to you, and (6) in any manner that interferes with other customers' use and enjoyment of the services provided by Opening Master. (7) you may not copy / share or distribute databases without permission of the owner. (you may copy individual games - but not the large section or whole database)

Prohibited Content

As used herein, "content" shall mean all text, graphics (including avatars), photographs, pictures, drawings, animation, audio, video, and any other material submitted, posted, viewed, transmitted, reproduced and/or distributed by any person or entity in connection with Opening Master.
You are prohibited from storing, posting, distributing or transmitting any unlawful content at Opening Master. Examples of unlawful content include but are not limited to direct threats of physical harm, stalking, any kind of pornography, and copyrighted, trademarked and other proprietary material used without proper authorization.

As used herein, "pornography" shall mean any explicit depiction or exhibition of sexual activity and/or sexual imagery that is intended to stimulate erotic, rather than PURELY aesthetic or emotional feelings.
Other prohibited content includes but is not limited to: (1) programs containing Trojan horses, virus and/or tools to compromise the security of Opening Master and/or other sites, (2) solicitations or advertisements, (3) suggestions or encouragement of illegal activity, (4) private information about any individual such as phone numbers, addresses, Social Security numbers or any other private information, and (5) duplicate posting or "spamming". Please note, that you can not upload chess games for which you don't have copyrights. Read carefully 10 Big Myths about copyright explained by Brad Templeton.

Protection of Intellectual Property

Opening Master complies with The Digital Millennium Copyright Act (“DMCA”), respects the intellectual property rights and requires that all users respected DMCA and intellectual property rights of others. By using Opening Master services you certify that your use does not infringe upon anybody intellectual property. Opening Master has been and will continue to vigorously enforce DMCA and to respond quickly to any allegations of intellectual property infringement.
Opening Master does not allow any copyright infringement and will, if notified properly and if not satisfied with a response by an accused party, remove or disable access to such content. Opening Master reserves the right to remove or disable access to content without prior notice as well as to terminate accounts and/or Opening Master membership of users whom Opening Master determines to be repeat infringers and/or violators any other clauses of Opening Master Terms of Service.
Opening Master may be required to disclose information to individuals asserting rights under the DMCA. By using Opening Master you authorize Opening Master to release information about you if required by law or subpoena, without any notice to you. By using Opening Master, you agree that you, and not Opening Master, are responsible for any violations of any intellectual property rights in any content that you upload to Opening Master.

If you believe that you the owner of intellectual property which was copied in such a way by someone on Opening Master site that such copying represents violation of your intellectual property rights, please This email address is being protected from spambots. You need JavaScript enabled to view it. with the following information included in your Claim Letter (please note that ALL information listed below is required from you in order for us to act upon your complaint):
    1.    Your/your company/organization name and contact information and a description of your rights including a signature of the owner of the claimed rights or a party duly authorized to act on behalf of the owner
    2.    A description of the property in question which you claim to be yours including the URL (location) of the media on Opening Master Website and a statement that you have a good faith belief that the use of said material has not been authorized by the copyright owner, its agent, or the Law
    3.    A statement by you (the owner or representative), made under penalty of perjury, that the above information in your Claim Letter is accurate and that you are either the owner of copyright or intellectual property or authorized to act on behalf of the owner.
Upon receipt of a proper notice as described above, Opening Master will confirm the existence of the alleged infringing content on Opening Master site, notify the user(-s) who posted the alleged infringing content, and take whatever action, in its sole discretion, it deems appropriate, including removal of the alleged infringing content from Opening Master site if Opening Master, at its sole discretion, deems evidence submitted in the claim sufficient and/or infringement obvious. A user who posted an alleged infringing content may respond to Opening Master notice by showing that either: (1) the infringing content has been removed or (2) the he/she has a an appropriate trademark registration or an appropriate valid license covering the use of the content or (3) that posting of the content does not, in fact, infringe upon the alleging party’s rights. If Opening Master determines, at its own full discretion, that the user who had posted content allegedly violating someone’s intellectual property rights, does not, in fact, infringe upon the alleging party’s rights and does not violate DMCA, then Opening Master will not remove, or will restore, the content in question.
Notwithstanding the foregoing, Opening Master will promptly comply with the terms of any court order relating to alleged trademark infringement by any user of Opening Master.

Protection of Opening Master database collection

Although chess players may freely copy individual games they may not copy the whole collection. Doing this is violation of copyright and work of OM. Several dummy games were inserted among entire collection of OM. These games were never played and are inserted there to identify the potential misuse or copy. (i.e. if these games appear in some other commercially known databases, it is clear the whole collection was copied)

Sales Taxes

OpeningMaster.com shall automatically charge applicable sales tax for orders to be delivered to addresses within European Union.
Opening Master may terminate any membership and delete any and all information, communications, postings, albums and image files at any time, without notice, for conduct violating this Agreement or other policies or guidelines set forth by OPENINGMASTER, CO. and elsewhere on the Opening Master web site.

Arbitration Clause

In the event a dispute shall arise between the parties to this agreement, it is hereby agreed that the dispute shall be referred to a European Union Arbitration office and/or Slovak Republic law court in accordance with the applicable Rules of Arbitration. The arbitrator's decision shall be final and legally binding and judgment may be entered thereon. Each party shall be responsible for its share of the arbitration fees in accordance with the applicable Rules of Arbitration. In the event a party fails to proceed with arbitration, unsuccessfully challenges the arbitrator's award, or fails to comply with the arbitrator's award, the other party is entitled to costs of suit, including a reasonable attorney's fee for having to compel arbitration or defend or enforce the award.

Force Majeure

Opening Master shall not be liable for any failure or delay in performance under this Agreement to the extent said failures or delays are proximately caused by causes beyond that party's reasonable control and occurring without its fault or negligence, including, without limitation, failure of suppliers, subcontractors, and carriers, or party to substantially meet its performance obligations under this Agreement, provided that, as a condition to the claim of non-liability, the party experiencing the difficulty shall give the other prompt written notice, with full details following the occurrence of the cause relied upon. Dates by which performance obligations are scheduled to be met will be extended for a period of time equal to the time lost due to any delay so caused.


In recognition of the relative risks and benefits of Internet business to Opening Master, Co., the risks have been allocated such that you agree, to the fullest extent permitted by law, to limit the liability Opening Master for any and all claims, losses, costs, damages of any nature whatsoever or claims expenses from any cause or causes, including attorneys’ fees and costs and expert witness fees and costs, so that the total aggregate liability of Opening Master shall not exceed $500, or your total fees and costs, whichever is smaller. It is intended that this limitation apply to any and all liability or cause of action however alleged or arising, unless otherwise prohibited by law.


Privacy Policy

Opening Master and OPENINGMASTER, CO. will not release any details regarding the member to any third party, except as required by law. Opening Master and OPENINGMASTER, CO. understand and respect your desire for privacy and we follow the new regulation on privacy policy in European Union called GDPR. Opening Master and OPENINGMASTER, CO. will not disclose any content posted by you unless required to do so by law or in the good-faith belief that such action is necessary to: (1) comply with the law or comply with a legal process served on Opening Master, (2) protect and defend the rights of Opening Master and OPENINGMASTER, CO., or (3) act in an emergency to protect the personal safety of our guests or the public. We may send regular newsletter emails to those who opted for it. If you are in the group of receivers and do not wish to continue either unsubscribe or let us know to our email administrator (at) openingmaster.com You can always read our Privacy Policy.

Copyright and Trademark

It is the obligation of the individual members to ensure that the posting of their chess games, commentaries, photos, and videos is not violating any copyright. Members are solely responsible for the content of their inputs. If you feel a member is violating your copyright, please contact that member or This email address is being protected from spambots. You need JavaScript enabled to view it..

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Terms of Service reviewed and approved May 25, 2018

  • About
  • Team
  • FAQ
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 14 years with focus on quality and quantity. More than 26 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 26 million human chess games.
  • It's baddest +

    If you are standard or professional ICCF players, the OM CORR database with 1,8 million
  • Over the board +

    The FIDE collection or OM OTB with more than 8.8 million games. This is the
  • Top Notch Support +

    Didn't find a game you were looking for? Write to us. Found a wrong game?
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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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Federations we supported Our Current and Previous Cooperations

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