Can I 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 /Applications/Chess.app/Contents/Resources/sjeng.ChessEngine and press enter to play:



Make moves with the coordinates of the origin and destination you want: e1e4 moves the piece at e1 to e4.

Sjeng doesn't take any command line arguments, but you can edit the config file (stored in /Applications/Chess.app/Contents/Resources/sjeng.rc). This will probably mess with your settings in the GUI Chess app; make a backup before editing.