and 2/ bullet?
5/0 blitz tourney

A tournament consists of five rounds of play. You play five matches and whoever wins the most matches wins the tourney.
5/0 blitz means you start with five minutes, and each move gives you an additional 0 seconds on your clock. If it said 5/15 then the game would start with five minutes and give you an addition 15 seconds on the clock and so on.
Blitz is used to describe any game that is five minutes long or more, but less than 15 minutes.
Bullet describes any game that is less than five minutes I believe.
What is it?