What is r chess?

r chess is a free, open-source chess program that you can run on your computer to play chess games against a computer opponent. It was originally created by Ralf Schäfer in 1999 and is written in the R programming language. r chess has several features, including the ability to play games against different levels of difficulty, the ability to save and load games, and the ability to play with different time controls. It also includes a graphical user interface (GUI) that allows you to easily interact with the program and play games. r chess is available for Windows, Mac OS X, and Linux.