# Chess UI Implementation Details

## Overview

This implementation provides a modern, interactive web UI for the chess engine using React with TypeScript and Tailwind CSS. The UI is designed to be fluid, responsive, and user-friendly, addressing the limitations of the previous Streamlit interface.

## Key Features

1. **Interactive Chess Board**:
   - Pieces can be moved by clicking on the source and destination squares
   - Valid moves are highlighted with green dots
   - Hint moves are highlighted with a light color
   - Last move is animated for better visibility

2. **Visual Feedback**:
   - Selected pieces are highlighted
   - Legal moves are shown with green dots
   - Hints highlight both source and destination squares
   - Move animations provide visual feedback

3. **Game Controls**:
   - New Game with configurable options (difficulty, color, time limit)
   - Undo Move functionality
   - Resign option
   - Board theme selection (brown or grey)

4. **Game Information**:
   - Current game status display
   - Move history tracking
   - Position analysis with evaluation bar
   - Material and positional advantage indicators

## Technical Implementation

### Components Structure

1. **App.tsx**: Main application component that organizes the layout
2. **ChessBoard.tsx**: Handles the chess board rendering and interaction logic
3. **GameControls.tsx**: Provides game control buttons and options
4. **GameInfo.tsx**: Displays game status, move history, and analysis

### API Integration

The UI communicates with the backend REST API using Axios. The main endpoints used are:

- `/game/new`: Start a new game with specified options
- `/game/move`: Make a move on the board
- `/game/state`: Get current game state
- `/game/hint`: Get a hint for the current position
- `/game/undo`: Undo moves
- `/game/resign`: Resign the current game

### Chess Logic

- FEN parsing to render the board state
- Legal move validation through the API
- Piece movement handling
- Game state tracking

### Styling

- Tailwind CSS for responsive design
- Custom CSS for chess-specific styling
- Animations for piece movement
- Theme support for different board styles

## Asset Usage

The implementation uses the provided chess assets:

- Board squares from both brown and grey themes
- Chess piece images for both black and white pieces

## Future Enhancements

1. **Drag and Drop**: Implement drag-and-drop functionality for piece movement
2. **Sound Effects**: Add sound effects for moves, captures, and game events
3. **Move Notation**: Display algebraic notation for moves in the history panel
4. **Time Control**: Add chess clock functionality
5. **Opening Explorer**: Integrate an opening book explorer
6. **Game Analysis**: Enhanced post-game analysis features
7. **Local Storage**: Save game state to browser storage for resuming games