I believe the software has different difficulty settings, and can be operated manually as well. As far as the win or lose %'s, I stated my belief in another thread that, I think they have a set amount of winnings they are allowed to let go out each day, which of course, dont exceed profits. In my opinion, if just depends when you enter, hopefully not after someone just won. Actually, I think there is someone in this dept. overseeing this every day, and keeps an eye on winnings and losses for the casino, and are allowed to randomly let certain players win at their discretion.