In larger races in both the ABA and NBL, then a 2nd moto of the same class but different racers is run right behind the first group. They also race three times but instead of the winners going to the Main they face their first group counterparts (who also went through the three-moto shake out) in the semi finals called the Semi-Main. Then the qualifiers face off in the Main. The same for races large enough for quarterfinals or Quarter-Mains, 1/8s and even 1/16s.