The Riding Club Team Eventer Challenges, at 90 and 100, are very popular grass-arena-based competitions held over a testing course of show jumps and cross country fences with an optimum time for completion based on 375m/min. The team with the lowest cumulative score are the winners, and in the event of equality for 1st place it is the team with riders finishing closest to (but under) the optimum time.
BVRC mow normally enter a team for the 90cm Challenge which is a very popular class. Due to the lack of teams entering the 100, this competition is now open to individuals too. The team is chosen from suitably qualified combinations from the Club often (but not exclusively) those who have competed in the Horse Trials teams, due to the need for combinations with good form at the relevant level.
Clubs may only enter one of the classes and neither riders nor horses may compete in any of the other Blenheim Challenges in the same year (ie RC, PC, BE at the different heights).