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Sanmill is a free, powerful UCI-like N men's morris program with CUI, Flutter GUI and Qt GUI.

Nine men's morris is a strategy board game for two players dating at least to the Roman Empire. The game is also known as nine-man morris, mill, mills, the mill game, merels, merrills, merelles, marelles, morelles, and ninepenny marl in English.



This distribution of Sanmill consists of the following files:

  •, the file you are currently reading.

  • Copying.txt, a text file containing the GNU General Public License version 3.

  • src, a subdirectory containing the full source code, including a Makefile that can be used to compile Sanmill CUI on Unix-like systems.

  • src/ui/flutter_app, a subdirectory containing a Flutter frontend.

  • src/ui/qt, a subdirectory containing a Qt frontend.

How to Build


Sanmill CUI has support for 32 or 64-bit CPUs, certain hardware instructions, big-endian machines such as Power PC, and other platforms.

On Unix-like systems, it should be easy to compile Sanmill directly from the source code with the included Makefile in the folder src. In general it is recommended to run make help to see a list of make targets with corresponding descriptions.

cd src
make help
make build ARCH=x86-64-modern

When reporting an issue or a bug, please tell us which version and compiler you used to create your executable. These information can be found by typing the following commands in a console:

./sanmill compiler

Qt Application

If you have started using Ubuntu or any Ubuntu-based Linux distribution, you must install Qt by running the following command as root:

sudo apt-get install qt5-default qtmultimedia5-dev qtcreator

Use Qt Creator to open , or use Visual Studio to open millgame.sln to build Qt Application.

Flutter App

Run ./ , copy src/ui/flutter_app/android/ to src/ui/flutter_app/android/, modify it, and then use Android Studio or Visual Studio Code to open src/ui/flutter_app to build Flutter App.

Understanding the code base and participating in the project

Sanmill's improvement over the last couple of years has been a great community effort. There are a few ways to help contribute to its growth.

Improving the code

If you want to help improve the code, there are several valuable resources:

  • In this wiki, many techniques used in Sanmill are explained with a lot of background information.

  • The latest source can always be found on GitHub.

  • Discussions about Sanmill take place in the Discussions.