The NBL and the international UCI uses the "Olympic" or Moto System of advancing to the Main. In the Moto System, you must race all three times to make the main or if the race is a large one semi finals. It is a formula combining how well you do with all the registered participant riders in your class racing all three times. It cumulatively determines who will race in the finals. The higher your points total, the more likely you will advance. For instance if you come in 1st, 1st and 1st, 40+50+60, which is 150 points, you are a virtual certainty to race in the Main (or in large races you are merely transferred to the quarter/semi-finals) barring disqualification for some reason. If you come in Last, Last, First, which in a race with eight men in your class translates to 0+0+60 or 60 points, you MIGHT race in the main (or in larger races the 1/8/quarter/semi finals) determining how well the others did. The person who came in 3rd place in all three motos or 30+40+50=120p would have a much better shot at making the Main than you. Even the person who came in 2nd+6th+6th or 35+25+35=95 would have a better shot even if you won the final moto.