Terms of use

1. Purpose and acceptance

These terms govern access to and use of the Nexa chess web application (the “Service”). By registering or using the Service you confirm you have read and accept these terms. If you disagree, do not use the Service.

2. Description of the Service

Nexa chess provides tools to view and analyse chess games imported from online platforms (such as Lichess or Chess.com), including aggregated metrics, phase estimates and, when available, engine-assisted evaluations. The Service is informational and for entertainment / training; it does not replace official ratings (FIDE or otherwise) or professional advice.

3. Cookies and analytics

The Service uses technical cookies and local storage required to operate (session, preferences and cache). audience measurement (e.g. Google Analytics 4, Plausible or similar) is only enabled if you accept it in the cookie notice. Details are in the cookies policy and the privacy policy.

4. Account and credentials

You are responsible for keeping your account and password confidential. Notify us immediately of any unauthorised use. Access via third parties (e.g. Google sign-in) is also subject to that provider’s terms.

5. Acceptable use

You agree not to:

• Use the Service in a way that breaches law, third-party rights or external API terms.
• Attempt to access other users’ data, bypass security measures or overload the infrastructure.
• Resell or exploit the Service without express permission.

6. Third-party data and public games

Imported games may contain opponents’ public names and data already visible on the source platforms. You are responsible for using the Service in line with those platforms’ rules and applicable law.

7. Limitation of liability

The Service is provided “as is” and “as available”. Metrics, phase Elo, virtual FIDE and other estimates may contain errors or inaccuracies because they depend on game samples, engine parameters, statistical conversions and API availability. To the extent permitted by law, Nexa chess is not liable for indirect damages, lost profits or data loss except in cases of proven wilful misconduct or gross negligence.

8. Changes and availability

We may change or discontinue features with or without notice. Updated terms will be published here; continued use after changes may mean you accept the new conditions.

9. Governing law

Unless mandatory law provides otherwise, and without prejudice to your rights as a consumer, these terms are governed by Spanish law. Disputes shall be submitted to the courts of Spain unless mandatory law assigns a different non-waivable jurisdiction.