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Athena

Athena is a Python-based chess engine using negamax algorithm with alpha-beta pruning, piece-square tables, Simplified Evaluation Function and move ordering

Features

  • Alpha-beta Pruning: Implements alpha-beta pruning for move searching to improve efficiency.
  • Move Ordering: Orders moves based on heuristics like captures and promotions to prioritize more promising moves.
  • Evaluation Function: Utilizes Tomasz Michniewski's Simplified Evaluation Function along with piece-square tables for board evaluation.
  • Quiescence Search: Implements quiescence search to handle positions with high tactical activity and reduce horizon effects.
  • UCI Protocol Support: Implements a slice of the Universal Chess Interface (UCI) to allow interaction with chess GUIs like lichess.org.
  • Command-line Interface: Provides a simple command-line user interface for playing chess against the engine.

Use it via Command Line

Start the engine with:

python UI.py

  8 ♜ ♞ ♝ ♛ ♚ ♝ ♞ ♜
  7 ♟ ♟ ♟ ♟ ♟ ♟ ♟ ♟
  6  · ·  ·  ·  ·  ·  · ·
  5  · ·  ·  ·  ·  ·  · ·
  4  · ·  ·  ·  ·  ·  · ·
  3  · ·  ·  ·  ·  ·  · ·
  2 ♙ ♙ ♙ ♙ ♙ ♙ ♙ ♙
  1 ♖ ♘ ♗ ♕ ♔ ♗ ♘ ♖
    a b c d e f g h

Your move (e.g. g1h3):

UCI Engine

Start the engine with:

python main.py

The engine supports the UCI protocol for communication with compatible GUIs. Refer to the UCI interface documentation for more information on interaction.

Lichess.org

You can play against the engine on lichess.org using the ShailChoksi/lichess-bot bridge and a BOT account. See the section on lichess.org in the Usage instructions for more details. You can also look the bot up on lichess as "Athena-AI".