Pachi 9.99 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The program's installer is commonly called pachi.exe. The actual developer of the free software is Petr Baudis.
The software relates to Games. We cannot guarantee that the program is safe to download as it will be downloaded from the developer's website. Before launching the program, check it with any free antivirus software. The most popular versions among Pachi users are 9.9 and 1.0.
From the developer:
Pachi is a simple modular framework for programs playing the game of Go/Weiqi/Baduk, and a reasonably strong engine built within this framework. The resulting binary program `Pachi` is a GTP client. Connect to it with your favorite Go program interface (e.g. gogui or qgo), or use kgsGtp to connect it to KGS. The pachi program can take many parameters, as well as the particular engine being used. The defaults should be fine for initial usage.
You may want to check out more software, such as GameArena The Arena, GW Team Builder or DM Secretary, which might be related to Pachi.