I don't worry about if its 9 players, 8 players, 7 players, 6 players or HU. I just keep it simple and worry about adapting and playing poker and wining instead of worrying about the number of players. Theoretically and statistically speaking the less players you are up against the easier it should be. the more opponents, the more probabilities of someone else other than your cards winning goes up. just simple statistics.