blitz games are not currently fully supported. When you try to create a blitz tournament, you will receive the following warning:
"Warning: Creating tournaments with Live games is not recommended!
In Live games, there is a higher risk of players dropping out of their games unwillingly. This risk increases with faster games or when playing multiple live games at the same time. Especially, there is a great chance the players will time out before they realize their game started.
If you decide to run a tournament with Live games, moderators and players should always agree on a time when each single game would be launched manually. Remember, that it might prove difficult to reach such an agreement with players from different time zones.