macOS
Homebrewverified · 100%
brew install pachilocal Homebrew formula metadata
brew / rank 5552
Install pachi with Homebrew, apt, dnf
Software for the Board Game of Go/Weiqi/Baduk. Version 12.90 via Homebrew; verified 2026-09-19. Also installable with debian: sudo apt install pachi.
install
Additional install commands
Linux
Debian aptverified · 92%
sudo apt install pachiDebian stable package indexes · pachi · source: deb.debian.org
Fedora dnfverified · 92%
sudo dnf install pachiFedora Rawhide package metadata · pachi · source: dl.fedoraproject.org
overview
Package summary
Software for the Board Game of Go/Weiqi/Baduk
Project links
Commands and aliases
- pachi
history
Project history and usage
Pachi is an open-source Go, Weiqi, or Baduk engine and research framework built around Monte Carlo Tree Search and the Go Text Protocol.
Project history
Petr Baudis originated Pachi as both a modular framework for Go-playing programs and a strong engine within that framework. Jean-loup Gailly contributed extensively to distributed search, tuning, memory allocation, and time management; later maintenance continued under lemonsqueeze.
The 2010 paper by Baudis and Gailly presented Pachi as a state-of-the-art open-source Go program centered on RAVE-based Monte Carlo Tree Search, with work on time control, dynamic komi, criticality, and parallel search. Later releases added pattern and deep-learning guidance while retaining the project's GTP-oriented architecture.
Adoption history
Pachi became one of the notable open-source engines from the Monte Carlo Tree Search era of computer Go. Its official history and research material describe competitive online rankings and distributed-cluster play.
The engine is packaged as a command-line GTP program rather than a self-contained desktop game. That encouraged use with independent frontends and Go servers, including GoGui, Sabaki, Lizzie, and kgsGtp.
How it is used
Run Pachi as a GTP engine behind a compatible graphical frontend or connect it to a Go server through a GTP bridge. The defaults provide an initial configuration, while command-line parameters control engines, logging, networks, rules, and analysis behavior.
Pachi does not document a persistent application configuration or credentials file. Internet-server authentication belongs to the selected frontend or bridge rather than the engine.
Upstream warns that its GTP parser is not secure and should not be exposed directly to untrusted users.
Why package nerds care
Pachi preserves an important generation of computer-Go engineering: UCT search, RAVE statistics, pattern-guided playouts, dynamic komi, and distributed search in a modular C codebase.
Its package boundary illustrates the composable Unix model particularly well: an engine speaks GTP, a separate frontend supplies the board and analysis interface, and optional networks or cluster resources improve play.
Timeline
- 2010: Baudis and Gailly published “Pachi: State of the Art Open Source Go Program.”
- 2010s: Pachi developed distributed search, pattern guidance, and deep-learning-assisted play.
- 2026: The project released Pachi 12.90 and remained available through Homebrew.
Related projects
- GNU Go represents the earlier knowledge-driven open-source Go-engine tradition.
- KataGo represents the later neural-network and self-play generation of strong Go engines.
- Sabaki and GoGui are GTP frontends capable of presenting Pachi's play and analysis.
Sources
security posture
Risk level: green
narrow executable package without higher-risk signals.
Risk classifier
green risk · low confidence · appliance
Why
- narrow executable package without higher-risk signals
Signals
- metadata:no-higher-risk-signals
Install behavior
- No Homebrew post-install hook is recorded in formula metadata.
- Homebrew bottle metadata is available for 5 platform targets.
- Installs with 8 runtime dependencies.
- Build metadata lists 3 build dependencies.
Recommended review
Before unattended agent use, check whether the tool reads plaintext credentials, writes remote state, publishes artifacts, or shells out to plugins.
executables
Installed executables
| Command | Kind | Exposure | Note |
|---|---|---|---|
pachi | cli | global executable |
freshness
Version and freshness
These signals separate page generation age, package-manager activity, and upstream release comparison. Version lag is warned only when an evidence URL and comparable versions are present.
page generated2026-11-04
manager version12.90
manager updated2026-09-19
local dataok
upstreamcurrent
latest detectedpachi-12.90-homebrew
https://github.com/pasky/pachi
- okNo freshness warnings were generated.
install metadata
Package metadata
| Package key | brew:pachi |
|---|---|
| Version | 12.90 |
| Package manager | Homebrew |
| Package manager page | https://formulae.brew.sh/formula/pachi |
| Homepage | https://pachi.or.cz/ |
| Repository | https://github.com/pasky/pachi |
| Upstream docs | https://pachi.or.cz/ |
| License | GPL-2.0-only AND BSD-2-Clause |
| Source archive | https://github.com/pasky/pachi/archive/refs/tags/pachi-12.90-homebrew.tar.gz |
| Last updated | 2026-09-19T13:36:12Z |
| Pulse | updated |
| Dependencies | abseil, boost, gflags, glog, hdf5, katago, openblas, protobuf |
| Build dependencies | cmake, ninja, wget |
| Bottle | available (on arm64_golden_gate, arm64_linux, arm64_sequoia, arm64_tahoe, x86_64_linux) |
| Homebrew post-install | not defined |
| Service | none declared |
registry facts
Source database details
| Source Database | Homebrew formula API |
|---|---|
| Tap | homebrew/core |
| Full Name | pachi |
| Version Scheme | 0 |
| Revision | 6 |
| Head Version | HEAD |
| Bottle Stable Root URL | https://ghcr.io/v2/homebrew/core |
| Deprecated | no |
| Disabled | no |
| Keg Only | no |
| URL Keys |
|
source database matches
Other package-manager records
Matches are pulled from external package-manager indexes and kept separate from local Automic Vault package links.
Debian apt95%
pachi 1:1.0-15
Platform game featuring Pachi el marciano
http://dragontech.sourceforge.net/
sudo apt install pachi- Section: games
- Architecture: amd64
- 4 dependencies
- normalized package name match
- Matched by: Pachi
Debian apt95%
pachi-data 1:1.0-15
Platform game featuring Pachi el marciano (data files)
http://dragontech.sourceforge.net/
sudo apt install pachi-data- Section: games
- Architecture: all
- Source Package: pachi
- 1 optional deps
- normalized package name match
- Matched by: Pachi
Ubuntu apt95%
pachi 1:1.0-10
Platform game featuring Pachi el marciano
http://dragontech.sourceforge.net/
sudo apt install pachi- Section: universe/games
- Architecture: amd64
- 4 dependencies
- normalized package name match
- Matched by: Pachi
Ubuntu apt95%
pachi-data 1:1.0-10
Platform game featuring Pachi el marciano (data files)
http://dragontech.sourceforge.net/
sudo apt install pachi-data- Section: universe/games
- Architecture: all
- Source Package: pachi
- 1 optional deps
- normalized package name match
- Matched by: Pachi
dnf95%
pachi 1.0-45.fc45
Pachi El Marciano - Platform Game
http://dragontech.sourceforge.net/index.php?main=pachi&lang=en
sudo dnf install pachi- License: GPL-2.0-or-later
- Category: Unspecified
- Architecture: x86_64
- Source Package: pachi
- 6 dependencies
- 4 provides
- normalized package name match
- Matched by: Pachi
source trail
Generated from repository data
This page is generated by av-web from the private package SQLite artifact built by scripts/generate-pkg-sqlite.py.
Combined YAML source
View the package source record on GitHub.
Used sources
- Geiger risk classifier
- cross-ecosystem install command graph
- curated package history
- external package-manager database matches
- package relationship graph
- package version freshness
- package-page enrichment
- pkg.so package database
- pkgdb category and tag curation