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# Privacy Policy

**Last updated: September 29, 2025**

## 1. Introduction

Chess Board Notation Trainer ("we," "our," or "us") operates the website http://chessnotation.org (the "Service"). This Privacy Policy explains how we collect, use, and protect your personal information when you use our chess training service.

## 2. Information We Collect

### 2.1 Personal Information
When you create an account, we collect:
- **Email address**: For account creation and communication
- **Password**: Encrypted and securely stored
- **User preferences**: Game settings, sound preferences, board display options

### 2.2 Usage Information
We automatically collect:
- **Game statistics**: Scores, accuracy rates, training progress, time spent
- **Device information**: Browser type, operating system, screen resolution
- **Usage patterns**: Features used, session duration, game modes played

### 2.3 Cookies and Local Storage
- **Essential cookies**: For login sessions and basic functionality
- **Settings storage**: To remember your preferences (sound, labels, countdown)
- **Authentication tokens**: To keep you logged in securely

## 3. How We Use Your Information

### 3.1 Service Provision
- Create and manage your user account
- Save your game progress and preferences
- Provide personalized training experiences
- Process subscription payments (if applicable)

### 3.2 Service Improvement
- Analyze usage patterns to improve the training system
- Develop new features and game modes
- Fix bugs and optimize performance
- Understand learning effectiveness

### 3.3 Communication
- Send account-related notifications
- Provide customer support responses
- Share important service updates
- Send promotional content (only with your consent)

## 4. Information Sharing and Disclosure

### 4.1 We DO NOT Sell Your Data
We never sell, rent, or trade your personal information to third parties for marketing purposes.

### 4.2 Limited Sharing
We may share information only in these specific circumstances:
- **Service Providers**: Hosting services, payment processors (with strict data processing agreements)
- **Legal Requirements**: When required by law, court order, or to protect our rights
- **Business Transfers**: In case of merger, acquisition, or sale of assets (with user notification)
- **Your Consent**: When you explicitly agree to sharing

## 5. Data Security

### 5.1 Security Measures
- **Encryption**: All data transmitted using HTTPS/TLS encryption
- **Password Security**: Passwords are hashed and salted, never stored in plain text
- **Access Control**: Limited employee access to personal information
- **Regular Updates**: Security patches and system updates applied promptly

### 5.2 Data Retention
- **Account Information**: Retained while your account is active
- **Game Statistics**: Kept to track your progress and improvement
- **Usage Data**: Aggregated and anonymized after 12 months
- **Deleted Accounts**: All personal data permanently removed within 30 days

## 6. Your Rights and Controls

### 6.1 Account Management
- **Access**: View all your personal information and game statistics
- **Update**: Modify your email, password, and preferences at any time
- **Delete**: Request complete account deletion and data removal
- **Download**: Export your game data in a readable format

### 6.2 Privacy Controls
- **Email Preferences**: Opt-out of promotional emails (account emails still required)
- **Data Collection**: Contact us to limit certain data processing activities
- **Cookie Control**: Manage cookies through your browser settings

## 7. Regional Privacy Rights

### 7.1 European Union (GDPR)
If you're located in the EU, you have additional rights:
- **Right to Access**: Get copies of your personal data
- **Right to Rectification**: Request correction of inaccurate data
- **Right to Erasure**: Request deletion of your personal data
- **Right to Portability**: Receive your data in a structured format
- **Right to Object**: Object to processing for direct marketing
- **Right to Complain**: Lodge complaints with your local data protection authority

### 7.2 California (CCPA)
If you're a California resident, you have the right to:
- **Know**: What personal information we collect and how it's used
- **Delete**: Request deletion of your personal information
- **Opt-Out**: We don't sell personal information, so this doesn't apply
- **Non-Discrimination**: We won't discriminate against you for exercising your rights

## 8. Children's Privacy

Our service is intended for users 13 years and older. We do not knowingly collect personal information from children under 13. If we discover we have collected information from a child under 13, we will delete it immediately.

Parents who believe their child has provided information to us should contact us at [pavalk6ua@gmail.com].

## 9. International Data Transfers

Your information may be processed on servers located outside your country. We ensure appropriate safeguards through:
- **Adequate Protection**: Only transferring to countries with adequate data protection laws
- **Contractual Safeguards**: Standard contractual clauses with service providers
- **Your Consent**: Explicit consent when required by law

## 10. Third-Party Services

### 10.1 Payment Processing
We use secure third-party payment processors for subscriptions. They have their own privacy policies and security measures.

### 10.2 Hosting and Infrastructure
Our servers are hosted by reputable cloud providers who maintain high security standards.

### 10.3 External Links
Our service may contain links to other chess-related websites. We are not responsible for their privacy practices.

## 11. Data Breach Notification

In the unlikely event of a data breach affecting your personal information, we will:
- **Immediate Action**: Secure the breach and assess the impact
- **Authority Notification**: Report to relevant authorities within 72 hours (where required)
- **User Notification**: Inform affected users promptly via email
- **Remediation**: Take steps to prevent future breaches

## 12. Changes to This Privacy Policy

We may update this Privacy Policy periodically to reflect changes in our practices or legal requirements. We will:
- **Notify Users**: Send email notifications for material changes
- **Post Updates**: Display the updated policy with a new "Last updated" date
- **Continued Protection**: Maintain your privacy rights under updated terms

## 13. Contact Information

### 13.1 General Privacy Questions
For questions about this Privacy Policy or your personal information:
- **Email**: [pavalk6ua@gmail.com]
- **Subject Line**: "Privacy Policy Inquiry"

### 13.2 Data Protection Requests
To exercise your privacy rights (access, deletion, correction):
- **Email**: [pavalk6ua@gmail.com]
- **Subject Line**: "Data Protection Request"
- **Include**: Your registered email address and specific request

## 14. Legal Basis for Processing (EU Users)

We process your personal data based on:
- **Contract Performance**: To provide the chess training service
- **Legitimate Interests**: To improve our service and prevent abuse
- **Consent**: For marketing communications and optional features
- **Legal Obligations**: To comply with applicable laws

## 15. Automated Decision Making

We do not use automated decision-making or profiling that would significantly affect you. All game recommendations and features are based on your explicit choices and preferences.

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**By using Chess Board Notation Trainer, you acknowledge that you have read and understood this Privacy Policy.**