Chess Pressure

A web application that visualizes pressure maps on a chess board -- showing which squares are controlled by white vs. black across every move of a game.

What is "pressure"?

For each square on the board, pressure is the net number of pieces attacking it. Positive values mean white controls the square; negative means black does. Two modes are available:

• Unweighted -- each attacking piece contributes +1 or -1.
• Weighted -- each attacking piece contributes its material value (pawn=1, knight/bishop=3, rook=5, queen=9, king=1).

Features

• Step through famous built-in games move by move and watch the pressure heatmap evolve.
• Upload your own PGN to analyze any game.
• Make moves from any position and see legal moves + pressure updates in real time.
• FastAPI backend with a lightweight static frontend.

Built-in Games

Quickstart

# Install dependencies
pip install fastapi uvicorn python-chess

# Run the server
python -m chess_pressure.app

The app starts on http://localhost:8888.

API

Project Structure

chess_pressure/
  __init__.py
  app.py       # FastAPI routes and static file serving
  engine.py    # Pressure computation, PGN parsing, move logic
  games.py     # Built-in famous games (PGN data)

License

MIT