Race condition
A race condition or race hazard is the behavior of an electronics, software, or other system where the system's substantive behavior is dependent on the sequence or timing of other uncontrollable events. It becomes a bug when one or more of the possible behaviors is undesirable.
Set Weights
Set Weights (SW) is a condition for a Thoroughbred horse race. Horses carry a weight based on their age and sex. In a mixed sex race, fillies and mares will usually carry less than colts, geldings and horses. Additional weight, or penalties, can also apply as a condition of the race. Many of the top races, particularly age restricted races, are set weights races.