Privacy Policy

1. Information We Collect

To provide our chess training services and ensure a personalized experience, we may collect the following information:

• Account and Authentication Information: When you register using Google OAuth, we receive and store your email address, profile name, and profile image URL. We use this strictly to authenticate you and manage your user profile.
• User-Generated Content: We store the chess materials you upload, including Portable Game Notation (PGN) files, annotations, chess puzzles, videos, or external video references (e.g., Bilibili, YouTube URLs) that you import for training.
• Training and Activity Data: We log and analyze your interaction with training modules, including solved/attempted tactics, chess move timings, customized lesson completions, opening lines memorized, and overall progress statistics.
• Technical Usage Information: When accessing our web application, we automatically capture device and usage details (such as IP addresses, browser types, and operating system information) to optimize performance and protect against abuse.

2. How We Use Your Information

We utilize your information for the following purposes:

• To provide, operate, and maintain the features and functionalities of the Service.
• To sync your settings, PGN files, and training history across all your logged-in devices.
• To customize and dynamically update your daily training materials based on your solving history and tactical strengths/weaknesses.
• To communicate with you regarding security updates, technical support requests, or necessary transactional messages.
• To detect, prevent, and address technical errors, potential abuse, or fraudulent activities.

3. Information Sharing and Disclosure

We do not sell, rent, or trade your personal data. We only share information under the following limited circumstances:

• With Your Consent: If you are associated with a coach or training group, you explicitly authorize the platform to share your puzzle stats, game completion rates, and error logs with your designated coach or group administrator.
• Service Providers: We may share data with reliable third-party infrastructure and cloud service providers (such as Supabase and hosting platforms) who perform essential technical tasks on our behalf, strictly under confidentiality agreements.
• Legal Requirements: We may disclose information if required to do so by applicable law, or in response to valid requests by public authorities.

4. Data Security

We implement robust, industry-standard administrative, physical, and technical security measures—including SSL/TLS encryption, secure database queries, and token-based sessions—to guard your personal data against unauthorized access, loss, alteration, or disclosure.

5. Your Choices and Rights

You have full control over your personal data. You can:

• Review and edit your profile settings within the account dashboard.
• Delete uploaded PGN files, custom training sets, and individual training history logs.
• Request the permanent deletion of your entire user account and all associated data by contacting our support team at [email protected].

6. Cookies

We use cookies and similar session tokens (such as browser local storage) to keep you authenticated, remember your preferences (like theme and language settings), and monitor basic service metrics. You can manage or disable cookies via your browser settings, though some features of the Service may not function properly without them.

7. Updates to This Policy

We may periodically revise this Privacy Policy to reflect updates in our features, security practices, or legal requirements. We will notify you of any changes by updating the "Last Updated" date at the top of this page. Your continued use of the Service after changes are posted constitutes your acceptance of the updated policy.

8. Contact Us

If you have questions, feedback, or concerns regarding this Privacy Policy or our data handling practices, please reach out to us at:

Email: [email protected]