Shed has a point. Your record against Chelsea is not just bad its notable bad, unusually so. The key is going to have to be in the way the game is approached. There is going to have to be a change from one the sides if 450 mins without a goal is going to be transformed in 3 in 90mins, if Wenger is going to win for the first time in 13 games. All those games Arsenal have had a team capable of scoring and winning, but there must be a reason why it hasn't happened. Unless you have reason to believe there is something that has changed, I can't see why you'd predict a different outcome.