The Challenge Cup is a Chinese online tournament featuring ten invited teams playing for a total of 50,000 CNY which is roughly $7,200 USD.
The tournament is divided into two stages with the first stage being the group stage where the teams are divided into two teams. When the groups are completed the bottom team in each group gets knocked out and the top two are seeded into the upper bracket of the playoffs, the third and fourth are seeded into the lower bracket.
Two round robin group stage with best-of-two series.
Top four moves on to the playoffs.
Double elimination bracket with best-of-three series leading up to the Grand Finals.
The Grand Finals is a best-of-five series.