The Sky is the limit, rewarding the Champion of Sky. Made for 81 people. Each person gets a number as they sign up, and then go to these previously assigned brackets. The number placings were chosen completely at random. To enter the competition, they must fufill the one requirement, that they have been in the top 500 for at least three of the months they have played, or at least 50 games a month for 3 months. Not that hard. However, it does limit it to the semi better players who have been here. I think this is only fair, as there are only 81 spots.
http://forums.asobrain.com/index.php?board=56.0