Privacy Policy

ChessMaster — Last updated: October 2026

Developed by Software Technology Park

1. Information We Collect

ChessMaster is designed to be fully functional offline without an account. If you choose to sign in to access online multiplayer and rating synchronization, we collect the following information:

  • Account Information: When signing in via Google Credential Manager, we receive your Google Account ID, email address, and default display name. You can customize your in-game display name at any time.
  • Gameplay & Rating Data: Elo ratings, match outcomes (win, loss, draw, resignation), move counts, and match histories are stored on our servers to maintain leaderboards and match history.
  • Offline Gameplay: Pass-and-play matches, games against the built-in computer engine, and local settings (themes, sound, and haptics) are stored locally on your device and are never sent to our servers unless an authenticated rated match is reported.

2. Local Network & Connectivity

For Nearby (LAN) multiplayer, the app utilizes Network Service Discovery (NSD) and local UDP broadcasts to discover and connect with other devices on your local Wi-Fi or hotspot network. No internet connection or remote server transmission is required or used for LAN matches.

3. Advertising

ChessMaster displays advertisements via Google AdMob (banner and interstitial ads). AdMob may process device identifiers, IP addresses, and diagnostic information to serve and personalize ads, limit frequency, and combat fraud. For more details on how Google processes ad data, please visit Google's Privacy & Terms.

4. Third-Party Services & SDKs

  • Google Credential Manager / Google Sign-In – secure authentication
  • Google AdMob & User Messaging Platform (UMP) – ad serving and user consent management
  • Google Play Services – core platform functionality and app integrity

5. Data Storage & Security

Authentication tokens are verified directly against Google public keys, and sessions are secured using stateless cryptographic HMAC tokens. Your account records and match history are stored in a secure server database. We do not sell or lease your personal information to third parties.

6. Data Retention & Account Deletion

Local preferences and cached statistics remain on your device until the app is uninstalled or app data is cleared. If you wish to delete your online account, associated Elo rating, and match history stored on our servers, you may submit a deletion request through the contact details provided below.

7. Children's Privacy

ChessMaster is not directed at children under the age of 13. We do not knowingly collect personal identifiable information from children under 13.

8. Changes to This Policy

We may update this Privacy Policy periodically. Any modifications will be posted to this page with an updated revision date.

9. Contact

For questions regarding this Privacy Policy or your data, contact Software Technology Park through our official Google Play Store developer listing.

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