The Regents of the University of California. All rights reserved. By convention, black always moves first. With no arguments, .Nm will display a playing board and prompt for moves from the user.
Valid moves are a letter for the column and a number for the row of an empty board location.
The optional file .Ar inputfile can be used to restore a saved game. This option sets background mode. Input moves are read from standard input, the computer picks a move, and prints it to standard output. This option was intended for game tournaments where a referee program handles the board display and pits one program against another. Fl c Computer verses computer.