Chess Engine with Bitboard Representation

A complete chess engine built in Java from scratch, featuring bitboard representation, minimax search with alpha-beta pruning, and a Swing-based GUI.

Features

• Bitboard Representation: 12 separate 64-bit bitboards for efficient piece storage
• Complete Move Generation: All pieces, special moves (castling, en passant, promotion)
• Legal Move Validation: Handles pins, checks, and checkmate detection
• AI Opponent: Minimax search with alpha-beta pruning (configurable depth)
• GUI: Interactive chess board with piece images and move highlighting
• FEN Support: Load any position from FEN notation

Technical Highlights

• Precomputed attack tables for knights and kings
• Sliding piece move generation with ray-casting
• Position evaluation with material counting
• Make/unmake move system for search

How to Run

1. Clone the repository
2. Open in your Java IDE
3. Run gui/BoardPanel.java
4. Play as white against the AI (black)

Project Structure

src/
├── engine/
│   ├── Position.java          # Bitboard position representation
│   ├── Move.java              # Move representation
│   ├── MoveGenerator.java     # Move generation logic
│   ├── Evaluator.java         # Position evaluation
│   ├── Search.java            # Minimax + alpha-beta
│   └── GameState.java         # State snapshot for unmake
└── gui/
    ├── BoardPanel.java        # Chess GUI
    └── resources/
        ├── images/            # Piece images
        └── sounds/            # Move sounds