♟️ NautilusChess - Screen-Based Python Chess Engine

NautilusChess is a Python chess bot that plays through screen recognition. It uses a simplified Minimax algorithm and supports GUI interaction, external engines, and online play (unofficially).

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🐚 Why "Nautilus"?

Continuing the aquatic theme of famous chess engines like Stockfish and Rybka, "Nautilus" is a nod to a deep-sea creature known for its strategic shell structure — just like this bot’s positional logic.

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🔍 How It Works

• Captures screen pixels to locate and track chessboards on websites like:

  • Lichess
  • Chess.com
  • Chess24
  • ChessFriends

• Detects move highlights to infer game state.

• Prevents board resizing or moving mid-game.

• GUI or CLI modes supported.

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🧠 Chess Logic

• Uses a depth-3 Minimax algorithm (non-recursive loop-based for speed).
• Can integrate external chess engines.
• Optional Polyglot opening books for advanced play.

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📂 Project Structure

• krevetka.py — core chess logic
• main.py — GUI runner
• tools.py — screen capture & automation tools
• engines/ — external chess engines (.exe)
• images/ — board highlight RGB values
• polyglot/ — optional opening books

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🎵 Endgame Feature

Includes a free-to-use NCS track: Hard as Steel by Abbynoise, played at game end.

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⚠️ Disclaimer

This bot does not use official APIs and may violate ToS on platforms like Lichess. Use at your own risk.

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▶️ How to Run

pip install -r requirements.txt
python main.py         # With GUI
python krevetka.py     # CLI Mode

For better performance, use PyPy.

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📌 Note

The project contains redundant code and can be optimized further. Contributions are welcome!

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📜 License

MIT License – use, modify, and share freely.