JSChess

JSChess is a browser-based chess engine and GUI implemented in JavaScript. It features a playable chessboard, move generation, evaluation, and integration with Stockfish via WebAssembly. The project is designed for learning, experimentation, and playing chess directly in your web browser.

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Features

• Interactive chessboard with drag-and-drop piece movement
• FEN input/output for setting up and sharing positions
• Move generation, validation, and perft testing
• UCI engine support via Stockfish (WebAssembly)
• Visual board flipping and highlighting
• Opening book support (via bookXml.xml)
• Responsive UI with jQuery

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Project Structure

bookXml.xml         # Opening book in XML format
index.html          # Main HTML file (UI and script includes)
perftsuite.epd      # Perft test positions
README.md           # Project documentation
script.cmd          # Windows batch script for running/building
stockfish.wasm      # Stockfish chess engine (WebAssembly)
styles.css          # CSS styles for the UI
images/             # Chess piece and UI images
js/                 # JavaScript source files

Key JavaScript Files

• js/main.js: Application entry point and initialization
• js/board.js: Board representation, FEN parsing, and printing
• js/defs.js: Constants, enums, and utility functions
• js/gui.js: User interface logic and event handlers
• js/movegen.js: Move generation logic
• js/makemove.js: Move making and unmaking
• js/evaluate.js: Position evaluation
• js/search.js: Search algorithms and engine logic
• js/stockfish.js: Stockfish engine integration

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Usage

1. Clone or Download the Repository

   git clone https://github.com/SpaciousFish/JSChess.git
   cd JSChess

2. Open index.html in your browser

   No build step is required. All dependencies are included in the js/ folder.

3. Play Chess!

   • Use the board to make moves.
   • Enter FEN strings to set up custom positions.
   • Use the "Set Position" and "New Game" buttons for control.

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Credits

• Chess engine logic inspired by Bluefever Software's Chess Programming.
• Stockfish engine (WASM) from official Stockfish project.
• jQuery for DOM manipulation.

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License

This project is for educational and personal use. See individual file headers for more information.