Make sure you have Ruby installed. The best tutorial I found was The best tutorial I've found is this: Ruby Installation Tutorial
$ bundle install  in the terminal
            Run the command $ ruby chess.rb  to start the game
          
 
        
            Feel free to try out an existing game $ l and then $ almost_check 
          
 
        
            If you would like to win, enter d8 h4 as your next move
          
 
          