Legal

Terms of Service

The agreement that governs your use of Brilliant Chess.

Effective date: 22 July 2026 · Last updated: 22 July 2026

These Terms of Service (the “Terms”) are an agreement between you and Sunrise Labs and govern your use of the Brilliant Chess mobile application and related services (the “App”). Please read them carefully. Our Privacy Policy is part of these Terms.

The App is provided by Sunrise Labs, the trading name of Eleftherios Katiforis, based in Greece (“Sunrise Labs”, “we”, “us”, or “our”). Contact: [email protected].

Nothing in these Terms limits your mandatory rights as a consumer under the law of your country of residence. Where these Terms conflict with those rights, your mandatory rights prevail.

1. Acceptance of these Terms

By downloading, accessing, or using the App, you agree to these Terms and to our Privacy Policy. If you do not agree, do not use the App. If you use the App on behalf of someone else, you confirm you are authorized to accept these Terms for them.

2. Eligibility & age

The App is intended for a general audience and is not directed to children under 13 (or the minimum age required in your country, which may be higher). By using the App, you confirm you are at least that age. If you are under 18 (or the age of majority where you live), you confirm that your parent or legal guardian has reviewed and agreed to these Terms.

3. Your account

You can play as a guest (an anonymous account) or sign in with Google or an email address. Some features require an account.
You are responsible for activity under your account and for keeping your sign-in credentials secure. Tell us promptly at [email protected] if you suspect unauthorized use.
Provide accurate information and keep it up to date. Do not create an account for anyone else, share or sell your account, or maintain multiple accounts to gain an unfair advantage.
You can delete your account at any time (see our Account & Data Deletion page).

4. License to use the App

Subject to these Terms, we grant you a limited, personal, non-exclusive, non-transferable, revocable license to download and use the App for your own, non-commercial entertainment. You may not rent, lease, sell, sublicense, or otherwise commercially exploit the App or any part of it, except as expressly permitted.

5. Purchases, subscriptions & virtual items

Billing through Google Play

All purchases and subscriptions in the App are processed by Google Play, which is the seller/merchant of record. Your purchase is also subject to the Google Play Terms of Service. We do not receive or store your card or payment-instrument details.

Subscriptions & auto-renewal

Premium subscriptions are sold on a recurring basis (for example, monthly or yearly). Subscriptions renew automatically at the then-current price for the same period until you cancel. The price, billing period, and free-trial terms (if any) are shown to you before you purchase.

Cancellation

You can cancel a subscription at any time through Google Play (Google Play → Subscriptions). Cancellation takes effect at the end of the current billing period; you keep access until then. Deleting the App does not cancel a subscription.

Refunds & your EU withdrawal right

Refunds are handled by Google Play in accordance with the Google Play refund policies and your statutory rights. If you are an EU/EEA consumer, you generally have a 14-day right to withdraw from a purchase; however, for digital content and services that begin immediately, you may be asked to consent to immediate performance and to acknowledge that you thereby lose that withdrawal right once performance has begun. Nothing here limits any non-waivable statutory refund rights you have.

Virtual items & currency

The App includes virtual currency (“Brilliants”) and virtual items (such as cosmetics and boosts). These are licensed to you for use within the App only. They:

have no monetary value, are not real money or property, and cannot be redeemed for cash;
are non-transferable and cannot be sold or exchanged outside the App;
are non-refundable except where required by law; and
may be updated, re-balanced, limited, or discontinued, and any unused balance expires when your account is closed.

Price changes & promotions

We may change prices and offer promotions or discounts from time to time. Price changes to an existing subscription apply in line with Google Play’s rules, and you will be notified and asked to agree where required before a higher price applies. Promotional offers may have additional terms and eligibility rules and cannot be combined unless stated.

6. Fair play & anti-cheat

Fair play is essential to Brilliant Chess. In rated, competitive, or online play, you must not:

use a chess engine, another person, or any outside assistance to select or evaluate moves;
use bots, scripts, or automation to play, farm rewards, or manipulate results;
deliberately lose, manipulate your rating, or collude with others to affect outcomes or leaderboards; or
exploit bugs to gain an unfair advantage.

We monitor gameplay and account behavior for these violations, including through automated systems with human review. If we find a violation, we may (in proportion to the conduct) reset or remove ratings and rewards, restrict features, remove you from competitions, or suspend or close the account. You may contest a decision by contacting [email protected].

7. Acceptable use

When using the App, you agree not to:

choose a username, clan name, or other text that is unlawful, hateful, harassing, obscene, deceptive, or that impersonates another person or infringes anyone’s rights;
harass, threaten, or abuse other players;
break the fair-play rules in §6;
reverse engineer, decompile, or attempt to extract source code from the App, except to the extent this restriction is prohibited by applicable law;
interfere with, disrupt, or place undue load on the App or its servers, or circumvent security, rate limits, or access controls;
use the App for any unlawful purpose or in violation of these Terms.

8. Your content

“Your content” means the limited content you submit, such as your username, clan name, and the text of feedback or reports. You keep any rights you have in your content. You grant us a worldwide, non-exclusive, royalty-free license to host, store, display, and use your content as needed to operate, provide, and improve the App (for example, showing your username on leaderboards or a clan name to members).

You are responsible for your content and confirm you have the right to submit it. We may remove, refuse, or reset content (including usernames and clan names) that we reasonably believe violates these Terms, is offensive or infringing, or impersonates others. If you report content or players to us, we may review and act on that report.

9. Tournaments & competitions

The App may offer tournaments and competitions with in-app rewards (such as chests, virtual currency, or cosmetics). These rewards have no monetary value. Participation is subject to these Terms and any specific event rules. We may withhold, reduce, or void rewards, and adjust standings, where we reasonably suspect cheating, abuse, or a technical error affecting the result.

10. Our content & intellectual property

The App and its content — including the software, puzzles, puzzle and game databases, board and piece designs, artwork, text, logos, and trademarks — are owned by us or our licensors and are protected by intellectual-property laws. Except for the license in §4, we grant you no rights in them.

You may not, without our prior written permission:

scrape, crawl, bulk-download, data-mine, or use automated means to extract the App’s content or databases; or
use the App’s content, puzzles, or game data to train or develop any machine-learning or AI model, chess engine, dataset, or a product or service that competes with the App.

Using your own individual games for personal, non-commercial purposes (for example, reviewing or sharing a game you played) is permitted.

11. Third-party services

The App works with third-party services, including Google Play (purchases), Google / Firebase and Google AdMob (accounts, diagnostics, analytics, and ads), and Lichess (position analysis and endgame-tablebase features). Your use of those services is governed by their own terms and privacy policies, and we are not responsible for them. Advertisements are provided by third parties; we are not responsible for advertised products or services.

12. Notifications & mobile features

With your permission, the App sends push notifications and schedules on-device reminders (see the Privacy Policy, §9). You can turn these off in the App’s settings or your device settings. Standard carrier data charges from your mobile provider may apply to your use of the App.

13. Feedback

If you send us suggestions, ideas, or other feedback, you agree that we may use it freely, without restriction or any obligation to you, to operate and improve the App. Feedback is not confidential.

14. Suspension & termination

You may stop using the App and delete your account at any time. We may suspend, restrict, or terminate your access to the App or your account if:

you breach these Terms (including the fair-play or acceptable-use rules);
we reasonably suspect fraud, cheating, or abuse, or a risk to security or to other users;
we are required to do so by law or a valid request from an authority;
your account is inactive for an extended period; or
we discontinue the App or a feature.

Where reasonable and lawful, we will give you notice and, for measures that are not serious, an opportunity to address the issue; you can contest a decision at [email protected]. On termination, your license to use the App ends and you may lose access to your account, progress, and virtual items. Sections that by their nature should survive (such as §§8, 10, 13, 15–20) continue to apply.

15. Disclaimers

We work to provide a reliable, enjoyable App, but to the extent permitted by law the App is provided “as is” and “as available”, without warranties of any kind, and we do not warrant that it will be uninterrupted, error-free, or secure, or that defects will be corrected.

If you are a consumer, you have legal guarantees — for example, that digital content and services conform to the contract — and nothing in this section affects those mandatory rights.

16. Limitation of liability

To the maximum extent permitted by applicable law, we will not be liable for indirect, incidental, special, consequential, or punitive damages, or for loss of profits, data, goodwill, or virtual items, arising out of or relating to your use of the App. To the extent permitted by law, our total liability for any claim relating to the App is limited to the greater of the amount you paid us through the App in the 12 months before the claim, or EUR 50.

Nothing in these Terms excludes or limits our liability where it cannot be excluded or limited under applicable law — including liability for death or personal injury caused by our negligence, for fraud or fraudulent misrepresentation, or under mandatory consumer-protection law.

17. Indemnification

To the extent permitted by law, you agree to indemnify and hold us harmless from claims, damages, and reasonable costs arising from your unlawful use of the App, your breach of these Terms, or your infringement of a third party’s rights. This does not apply to the extent a claim results from our own act or omission, and it does not reduce your mandatory consumer rights.

18. Changes to the App and these Terms

We may update, add, or remove features, and we may update these Terms from time to time. If we make material changes, we will update the “Last updated” date and provide reasonable notice (for example, in the App). Changes do not apply retroactively. If you continue to use the App after changes take effect, you accept the updated Terms; if you do not agree, you should stop using the App and may delete your account.

19. Governing law & disputes

These Terms are governed by the laws of Greece, without regard to conflict-of-law rules. If you are a consumer, this choice does not deprive you of the protection of mandatory provisions of the law of your country of residence, and you may bring proceedings in the courts of your country of residence.

We would like to resolve any concern directly first — please contact [email protected]. If we cannot resolve it, EU/EEA consumers may be entitled to use an alternative dispute resolution (ADR) body and can contact their local consumer-protection authority. Subject to the consumer provisions above, the courts of Greece have jurisdiction over disputes relating to these Terms.

20. General terms

Entire agreement. These Terms and the Privacy Policy are the entire agreement between you and us regarding the App.
Severability. If any provision is found unenforceable, the rest remains in effect.
No waiver. Our failure to enforce a provision is not a waiver of it.
Assignment. You may not assign these Terms without our consent; we may assign them in connection with a merger, acquisition, or sale of assets, without reducing your rights.
Google Play. Google is not a party to these Terms and is not responsible for the App. These Terms are between you and us.
Force majeure. We are not liable for delays or failures caused by events beyond our reasonable control.

21. Contact

Sunrise Labs — Eleftherios Katiforis
Greece
Email: [email protected]