♞ ChessMG

CI Version Performance Python C++ Perft License

Blazing-fast chess move generation for Python, powered by a C++20 bitboard engine.

One pip install. 200 million moves per second. A Python API that stays out of your way.

Why ChessMG?
Fast Magic bitboards + zero-copy Cython bindings — roughly 50× faster than pure-Python move generators
Pythonic A clean ChessPosition / Move API with type annotations, UCI notation and rich move metadata
Complete Castling, en passant, promotions, check / checkmate / stalemate detection, legality checks
Verified Move generation validated against the standard perft reference values up to depth 8
Lean No runtime dependencies beyond NumPy — and less than 1 MB per position

Typical uses: engine prototyping, puzzle solvers, dataset generation for ML, move validation backends, perft research — anywhere Python convenience meets the need for raw speed.

🚀 Quick Start

Install

pip install chessmg

Prebuilt wheels cover Linux (x86_64, aarch64) and macOS (Intel, Apple Silicon) for Python 3.9–3.13. On other platforms pip falls back to building from source.

Or install the latest development version from source:

git clone https://github.com/osick/ChessMG.git
cd ChessMG
pip install .

Building from source requires a C++20 compiler (g++/clang), Cython and numpy.

Play

from chessmg import ChessPosition

pos = ChessPosition()                # standard starting position (or pass any FEN)

for move in pos.legal_moves():       # 20 legal moves, as rich Move objects
    print(move.uci)                  # "e2e4", "g1f3", ...

pos.make_move("e2e4")                # UCI strings or Move objects
pos.make_move("e7e5")
print(pos.fen)                       # rnbqkbnr/pppp1ppp/8/4p3/4P3/8/PPPP1PPP/RNBQKBNR w KQkq e6 0 2

pos.undo_move()                      # take it back

print(pos.turn)                      # Color.BLACK
print(pos.is_checkmate)              # False

print(ChessPosition().perft(6))      # 119060324 — in about half a second

Promotions, castling and en passant just work:

pos = ChessPosition("8/4P1k1/8/8/8/8/8/4K3 w - - 0 1")
pos.make_move("e7e8q")               # promote to queen
print(pos.fen)                       # 4Q3/6k1/8/8/8/8/8/4K3 b - - 0 1

📖 API at a Glance

ChessPosition

Member Description
ChessPosition(fen) Create position from FEN — raises ValueError on invalid or illegal input
legal_moves() List of legal Move objects
make_move(move) Play a move (UCI string or Move); full move semantics
undo_move() Undo the last move
fen Current position as a complete 6-field FEN string
turn Side to move (Color.WHITE / Color.BLACK)
is_check / is_checkmate / is_stalemate / is_game_over Game state
perft(depth) Count leaf nodes at the given depth
copy() Independent copy of the position

Move

Property Description
from_square / to_square Square indices (0–63)
from_square_name / to_square_name Algebraic notation ("e2")
uci UCI notation ("e2e4", "e7e8q")
promotion PieceType for promotions, else None
Move.from_uci("e2e4") Construct from a UCI string
Legacy low-level API (click to expand)

For backward compatibility, the lower-level API remains available:

from chessmg import ChessMoveGenerator, perft, moves

gen = ChessMoveGenerator("r3k2r/8/8/8/8/8/8/R3K2R w KQkq - 0 1")
arr = gen.moves()          # numpy array of shape (n_moves, 3): [from, to, flags]
n   = perft(fen, depth)    # one-shot perft; returns 0 for illegal positions

See chessmg/README.md for details.

🏁 Performance

Perft from the starting position, single-threaded (AMD Ryzen, g++ -O2):

Depth Nodes Time Speed
5 4,865,609 < 0.1 s ~166M NPS
6 119,060,324 0.5 s ~218M NPS
7 3,195,901,860 12.9 s ~247M NPS
8 84,998,978,956 6.7 min ~213M NPS

All results match the published perft reference values exactly.

How it's fast: magic bitboards for sliding pieces, pre-computed attack tables, perfect-hash lookups, cache-friendly data layout in the C++20 core — and Cython bindings that avoid copying on the way into Python.

Reproduce it yourself:

python tests/benchmark_perft.py
python tests/test_perft_start_fen.py 7 verbose

🗂️ Project Structure

ChessMG/
├── chessmg/              # Python package
│   ├── position.py       #   High-level API (ChessPosition, Move)
│   ├── libchessmg.pyx    #   Cython bindings
│   └── libcmg/           #   C++20 engine
│       ├── libcmg.*      #     Position wrapper, game states, perft
│       ├── libsurge.*    #     Bitboard core (based on surge)
│       └── tests/        #     C++ unit tests
├── tests/                # Python test suite + benchmarks
├── examples/             # Example scripts
└── docs/                 # Technical documentation

🛠️ Development

# Editable install with dev tools (pytest, black, mypy, pytest-cov)
pip install -e ".[dev]"

# Rebuild the extension in place after C++/Cython changes
python setup.py build_ext --inplace

# Run the test suite
pytest tests/

# Script-style correctness / perft tests (also run by `make test`)
python tests/test_correctness.py verbose
python tests/test_perft_start_fen.py 6 verbose
python tests/test_set_position.py verbose

Further reading:

📄 License

MIT License — see LICENCE for details.

Acknowledgments

  • surge — the C++ bitboard engine ChessMG's core is based on

ChessMG — chess move generation at engine speed, with Python comfort.

Report an issue · Documentation

Project links

Data verified by PyPI on Jul 19, 2026
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Key dates

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  • Released:
Newer release available (0.6.0)

1 maintainer

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Avatar for osick from gravatar.com osick

Credits

Author: Oliver Sick

GitHub Statistics

Data verified by PyPI on Jul 19, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

License

MIT License (MIT)

Requires

Python >=3.8

Provides Extra

dev

Tags

chess move generation perft bitboard engine

Classifiers

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0.5.1 This release

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