♞ ChessMG

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

📄 License

MIT License — see LICENSE. Third-party attribution is in NOTICE; it is kept out of LICENSE so the file stays byte-identical to the canonical MIT text and licence scanners classify it correctly.

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

Metadata

Release files for chessmg 0.6.0

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Source distribution (sdist)

Source distribution for chessmg 0.6.0
File	Size	Uploaded
chessmg-0.6.0.tar.gz	185.6 kB	Aug 20, 2026	Details

Built distributions (wheels)

Table of built distributions (wheels) for chessmg 0.6.0
File	Interpreter	ABI	Platform	Reset
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chessmg-0.6.0-cp313-cp313-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl 697.6 kB Aug 20, 2026	CPython 3.13	CPython 3.13	Linux glibc 2.28+ ARM64, Linux glibc 2.24+ ARM64	Details
chessmg-0.6.0-cp313-cp313-macosx_11_0_x86_64.whl 280.6 kB Aug 20, 2026	CPython 3.13	CPython 3.13	macOS 11.0+ x86-64	Details
chessmg-0.6.0-cp313-cp313-macosx_11_0_arm64.whl 277.8 kB Aug 20, 2026	CPython 3.13	CPython 3.13	macOS 11.0+ ARM64	Details
chessmg-0.6.0-cp312-cp312-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl 713.4 kB Aug 20, 2026	CPython 3.12	CPython 3.12	Linux glibc 2.24+ x86-64, Linux glibc 2.28+ x86-64	Details
chessmg-0.6.0-cp312-cp312-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl 699.8 kB Aug 20, 2026	CPython 3.12	CPython 3.12	Linux glibc 2.28+ ARM64, Linux glibc 2.24+ ARM64	Details
chessmg-0.6.0-cp312-cp312-macosx_11_0_x86_64.whl 281.0 kB Aug 20, 2026	CPython 3.12	CPython 3.12	macOS 11.0+ x86-64	Details
chessmg-0.6.0-cp312-cp312-macosx_11_0_arm64.whl 278.8 kB Aug 20, 2026	CPython 3.12	CPython 3.12	macOS 11.0+ ARM64	Details
chessmg-0.6.0-cp311-cp311-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl 723.2 kB Aug 20, 2026	CPython 3.11	CPython 3.11	Linux glibc 2.28+ x86-64, Linux glibc 2.24+ x86-64	Details
chessmg-0.6.0-cp311-cp311-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl 712.9 kB Aug 20, 2026	CPython 3.11	CPython 3.11	Linux glibc 2.28+ ARM64, Linux glibc 2.24+ ARM64	Details
chessmg-0.6.0-cp311-cp311-macosx_11_0_x86_64.whl 283.8 kB Aug 20, 2026	CPython 3.11	CPython 3.11	macOS 11.0+ x86-64	Details
chessmg-0.6.0-cp311-cp311-macosx_11_0_arm64.whl 278.2 kB Aug 20, 2026	CPython 3.11	CPython 3.11	macOS 11.0+ ARM64	Details
chessmg-0.6.0-cp310-cp310-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl 697.3 kB Aug 20, 2026	CPython 3.10	CPython 3.10	Linux glibc 2.24+ x86-64, Linux glibc 2.28+ x86-64	Details
chessmg-0.6.0-cp310-cp310-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl 688.1 kB Aug 20, 2026	CPython 3.10	CPython 3.10	Linux glibc 2.24+ ARM64, Linux glibc 2.28+ ARM64	Details
chessmg-0.6.0-cp310-cp310-macosx_11_0_x86_64.whl 284.1 kB Aug 20, 2026	CPython 3.10	CPython 3.10	macOS 11.0+ x86-64	Details
chessmg-0.6.0-cp310-cp310-macosx_11_0_arm64.whl 278.4 kB Aug 20, 2026	CPython 3.10	CPython 3.10	macOS 11.0+ ARM64	Details
chessmg-0.6.0-cp39-cp39-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl 695.8 kB Aug 20, 2026	CPython 3.9	CPython 3.9	Linux glibc 2.24+ x86-64, Linux glibc 2.28+ x86-64	Details
chessmg-0.6.0-cp39-cp39-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl 685.3 kB Aug 20, 2026	CPython 3.9	CPython 3.9	Linux glibc 2.24+ ARM64, Linux glibc 2.28+ ARM64	Details
chessmg-0.6.0-cp39-cp39-macosx_11_0_x86_64.whl 284.5 kB Aug 20, 2026	CPython 3.9	CPython 3.9	macOS 11.0+ x86-64	Details
chessmg-0.6.0-cp39-cp39-macosx_11_0_arm64.whl 278.9 kB Aug 20, 2026	CPython 3.9	CPython 3.9	macOS 11.0+ ARM64	Details

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Publishing repository: github.com/osick/ChessMG
Publishing commit: github.com/osick/ChessMG/tree/89e9795b526aa766b22607e90d6ce69936c6f216

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Release history Release notifications | RSS feed

This release

0.6.0 This release

Aug 20, 2026 21 release files

0.5.1

Jul 19, 2026 21 release files

chessmg 0.6.0

♞ ChessMG

Why ChessMG?

🚀 Quick Start

Install

Play

📖 API at a Glance

ChessPosition

Move

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1 maintainer

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Release files for chessmg 0.6.0

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`ChessPosition`

`Move`