Crews attempt to progress up their division by hitting ('bumping') the boat in front without being hit by the boat behind, with the ultimate aim of becoming "Head Of The River" i.e. top of the first division. The Head of the River is awarded the Torpids Challenge Cup, presented to the OUBC by President T.C. Edwards-Moss of Brasenose College Boat Club. Once a bump has taken place, the crew whose boat was hit has to continue racing (and is liable to be bumped again) whilst the bumping crew moves to the side. This can lead to a crew moving down several places during a day's racing. This is the principal difference in the rules between Torpids and Summer Eights, where both crews stop racing.