Shortly after Olga Korbut's stunning gold medal gymnastics performance on the uneven bars in the 1972 Munich Olympics, a move in her routine was banned from high-level international competitions.
The "Dead Loop" (sometimes called the "Korbut Flip") consists of a gymnast standing on the high bar, performing a backflip and grasping the bar again. A
video shows the move in the first fifteen seconds, then shows it again in slow motion.
No one has ever tried to replicate the move (in a competition at least) after experts pointed out the immense risks involved in its performance. It is a dangerous move that can very easily go horribly wrong and cause injuries that could result in paralysis.
As stunning as Olga's performance was, it was not awarded a perfect 10. The first perfect 10 was awarded to Nadia Comaneci (Romania) in the 1976 Montreal Olympics. Only two other gymnasts have been given a perfect 10 in the Olympics, Mary Lou Retton (USA) in 1984 and Daniela Silivaş (Romania) in 1988.
The International Gymnastics Federation changed the scoring system in 2006, varying scores across events and difficulty levels, meaning a perfect score can no longer be matched.