If I were feeling insufficiently geekish on any particular day, and thus found the GUI Chess App to lack an appropriate amount of tech credibility, is there a way to play chess on my Mac from the command line?
Yes! The OS X Chess app relies on the sjeng engine, which has a command line version. Type
Make moves with the coordinates of the origin and destination you want:
Sjeng doesn't take any command line arguments, but you can edit the config file (stored in