Chess Game with AI

A chess game implementation with a built-in AI opponent.

Features

• Play chess against a built-in AI opponent
• Choose to play as white or black pieces
• Undo moves
• Restart game at any time
• Move history tracking
• Visual move highlighting
• Modern and clean UI
• Proper chess piece movement rules
• Turn-based gameplay

Setup and Play

1. Open index.html in your web browser
2. Choose your color:
   • Click "Play as White" to move first
   • Click "Play as Black" to let AI move first
3. On your turn:
   • Click on one of your pieces to select it
   • Valid moves will be highlighted in green
   • Click on a highlighted square to make your move
4. The AI will automatically make its move after you
5. Use the controls:
   • "Undo Move" to take back your last move
   • "Restart Game" to start a new game

Game Rules

• Standard chess piece movements:
  • Pawns: Forward one square (or two on first move), capture diagonally
  • Rooks: Any number of squares horizontally or vertically
  • Knights: L-shaped movement (two squares in one direction, one square perpendicular)
  • Bishops: Any number of squares diagonally
  • Queens: Any number of squares in any direction
  • Kings: One square in any direction
• White always moves first
• Players take turns moving one piece at a time
• Pieces capture by moving to an opponent's square

AI Behavior

The AI makes decisions based on:

• Material value (pawns=1, knights/bishops=3, rooks=5, queens=9)
• Position evaluation:
  • Capturing opponent pieces
  • Controlling the center
  • Advancing pawns
  • Strategic positioning
• Includes some randomness for varied gameplay

Technical Details

• Built with vanilla JavaScript
• No external dependencies or API keys required
• Responsive design
• Unicode chess pieces
• Lightweight and fast

Future Improvements

• Check and checkmate detection
• Special moves (castling, en passant)
• Pawn promotion
• More sophisticated AI strategy
• Game end conditions
• Save/load game state

License

MIT License