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Restructured project from nested workspace pattern to flat single-repo layout. This eliminates redundant nesting and consolidates all project files under version control. ## Migration Summary **Before:** ``` alex/ (workspace, not versioned) ├── chess-game/ (git repo) │ ├── js/, css/, tests/ │ └── index.html └── docs/ (planning, not versioned) ``` **After:** ``` alex/ (git repo, everything versioned) ├── js/, css/, tests/ ├── index.html ├── docs/ (project documentation) ├── planning/ (historical planning docs) ├── .gitea/ (CI/CD) └── CLAUDE.md (configuration) ``` ## Changes Made ### Structure Consolidation - Moved all chess-game/ contents to root level - Removed redundant chess-game/ subdirectory - Flattened directory structure (eliminated one nesting level) ### Documentation Organization - Moved chess-game/docs/ → docs/ (project documentation) - Moved alex/docs/ → planning/ (historical planning documents) - Added CLAUDE.md (workspace configuration) - Added IMPLEMENTATION_PROMPT.md (original project prompt) ### Version Control Improvements - All project files now under version control - Planning documents preserved in planning/ folder - Merged .gitignore files (workspace + project) - Added .claude/ agent configurations ### File Updates - Updated .gitignore to include both workspace and project excludes - Moved README.md to root level - All import paths remain functional (relative paths unchanged) ## Benefits ✅ **Simpler Structure** - One level of nesting removed ✅ **Complete Versioning** - All documentation now in git ✅ **Standard Layout** - Matches open-source project conventions ✅ **Easier Navigation** - Direct access to all project files ✅ **CI/CD Compatible** - All workflows still functional ## Technical Validation - ✅ Node.js environment verified - ✅ Dependencies installed successfully - ✅ Dev server starts and responds - ✅ All core files present and accessible - ✅ Git repository functional ## Files Preserved **Implementation Files:** - js/ (3,517 lines of code) - css/ (4 stylesheets) - tests/ (87 test cases) - index.html - package.json **CI/CD Pipeline:** - .gitea/workflows/ci.yml - .gitea/workflows/release.yml **Documentation:** - docs/ (12+ documentation files) - planning/ (historical planning materials) - README.md **Configuration:** - jest.config.js, babel.config.cjs, playwright.config.js - .gitignore (merged) - CLAUDE.md 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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Chess Game - System Design
Architecture Overview
The chess game follows a modular, layered architecture with clear separation of concerns. The system is designed for extensibility, testability, and maintainability.
Architectural Style
- Pattern: MVC (Model-View-Controller) with Event-Driven Architecture
- Modularity: ES6 Modules for component isolation
- State Management: Centralized game state with immutable updates
- Communication: Event-based pub/sub for component decoupling
System Layers
1. Presentation Layer
- ChessBoardView: Visual board rendering
- ChessPieceView: Piece rendering and animations
- UIController: User input handling and feedback
- ThemeManager: Visual styling and customization
2. Business Logic Layer
- GameEngine: Core game rules and state management
- MoveValidator: Legal move validation and check detection
- MoveGenerator: All possible moves calculation
- GameController: Game flow orchestration
- TurnManager: Player turn handling
3. Data Layer
- BoardState: Current board configuration
- GameHistory: Move history and undo/redo
- GameConfig: Configuration and settings
- PersistenceManager: Save/load game state
4. AI Layer (Optional)
- AIPlayer: Computer opponent interface
- MoveEvaluator: Position evaluation
- SearchAlgorithm: Minimax with alpha-beta pruning
Core Principles
Single Responsibility
Each component has one clear purpose and reason to change.
Open/Closed Principle
Components are open for extension but closed for modification through interfaces and hooks.
Dependency Inversion
High-level modules depend on abstractions, not concrete implementations.
Event-Driven Communication
Components communicate through events to minimize coupling.
System Constraints
Performance
- Board updates: < 16ms (60 FPS)
- Move validation: < 5ms
- AI move calculation: < 2000ms (configurable)
Browser Compatibility
- Modern browsers (ES6+ support)
- Chrome 90+, Firefox 88+, Safari 14+, Edge 90+
Accessibility
- Keyboard navigation support
- Screen reader compatibility
- ARIA labels for all interactive elements
Security Considerations
Client-Side Only (Phase 1)
- No network communication
- Local storage only for persistence
- Input validation for all user actions
Future Network Play (Phase 2)
- WebSocket communication
- Move verification on server
- Anti-cheat measures
- Rate limiting
Scalability Strategy
Modular Extension Points
- Plugin system for new features
- Theme customization hooks
- AI difficulty levels
- Alternative rule sets (variants)
Performance Optimization
- Virtual DOM for efficient rendering
- Move generation caching
- Position evaluation memoization
- Web Workers for AI computation
Deployment Architecture
File Structure
chess-game/
├── index.html # Main entry point
├── styles/
│ ├── main.css # Core styles
│ ├── themes/ # Visual themes
│ └── responsive.css # Mobile support
├── src/
│ ├── core/ # Business logic
│ ├── ui/ # Presentation
│ ├── ai/ # AI components
│ └── utils/ # Shared utilities
├── assets/
│ ├── pieces/ # Piece images
│ └── sounds/ # Sound effects
└── tests/ # Test suite
Technology Stack
Core Technologies
- HTML5: Semantic structure
- CSS3: Styling and animations
- Vanilla JavaScript: ES6+ for logic
Optional Enhancements
- TypeScript: Type safety (future)
- Web Workers: Background AI computation
- Service Workers: Offline play
- IndexedDB: Persistent storage
Quality Attributes
Maintainability
- Clear code organization
- Comprehensive documentation
- Automated testing (unit + integration)
Testability
- Pure functions for core logic
- Dependency injection
- Mock-friendly interfaces
Usability
- Intuitive drag-and-drop
- Visual feedback for all actions
- Responsive design for all devices
Extensibility
- Plugin architecture
- Configuration-driven behavior
- Event hooks for customization