Generally, a racer is considered to be sandbagging when they deliberately avoid winning races, thus avoiding so-called "move up points" (which require a rider to race the next highest proficiency after a given number of races won). Sandbagging in BMX Racing is often practiced to ensure the rider stays at a lower proficiency long enough to compete in the NBL or ABA Grand National (held each year in September and November, respectively). This race is traditionally when year-end titles and awards are decided. Deliberate sandbagging is difficult to prove and, though track personnel have the authority to report such activity to their respective sanctioning body, disciplinary action or involuntary reclassification is seemingly quite rare. Sandbagging is a hotly debated issue in the BMX Racing community, and is such taboo that "call out threads" are sometimes started on message boards to publicly alert others in the community of a specific rider(s) conduct. Video games Sandbagging is also prevalent in some racing games, particularly those that feature power-ups that either aid the user or hinder the opponent. In the Mario Kart video game series, players will sometimes sandbag to get powerful items such as the Star or Lightning in order to batter the other racers, take shortcuts or defend themselves from other oncoming items. Team Race Sandbagging has become infamous with players holding back and getting the Lightning Item, which only affects racers on the opposing team, allowing the user's team to get a clear advantage. In Sonic & Sega All-Stars Racing, players may sandbag in order to get the powerful All-Star Moves, just to use them on the other players. RC car racing In radio controlled car racing, participants can usually choose the classes in which they want to compete. Many tracks have levels such as rookie, sportsman, intermediate, and expert, for the same type of vehicle. So a driver may claim to be at the sportsman level when in fact they are easily fast enough to be competitive in intermediate, but they know they will have a much easier time winning if they compete in the lower class. This may happen more often at larger races that award trophies and other prizes, compared with local club races that usually award the winner only with a podium photo. Sandbagging is frowned upon by track owners and fellow competitors since it is clearly not a fair way to compete, so some race