I thought since this app was paid and had so many great reviews it would at least use some aspect of Machine Learning to make the computer more difficult. But no, it rigs the dice to make the computer more difficult. I was fed up with just feeling like it was rigged, and since Im an unemployed statistician with too much time on my hands, I decided to do an analysis on rolls. Without a doubt, the expert mode computer has an insanely large number of "favorable" rolls while I receive an abnormally large number of "unfavorable" rolls. Also, one of the main reasons I purchased this app was so I could play my boyfriend. However, "play a friend" mode does not work properly and keeps telling either of us that the other has forfeited the game (although neither of us have). So really this app isnt any better than the rest of the backgammon options out there.