Diagonal distance between the two bars: 130–180 cm (adjustable)
Scoring
As with other gymnastic events scoring is based on the Fédération Internationale de Gymnastique's Codes of Points (these are not available online). And common to other artistic gymnastics events judges look at difficulty and form (which can be described, perhaps, as elegance and control). Judges will award points for holding the body straight at the handstand point of a swing, ease of movement between the bars and fluency of motion. Judges will penalise unplanned swings used to regain lost momentum, clipping the other bar with a stray foot and a whole half a point is lost if the competitor falls off the bars. As with events the dismount is important, the judges looking for a stuck landing: both feet hitting the mat at the same time, feet together, with no steps, hops or strides required to maintain balance.
There are also required movements such as a movement from the lower to the upper bar, a movement from the upper to the lower bar and a movement wherein the gymnast's centre of gravity moves towards the bar.
External links
US Gym Net's glossary of uneven bars skills (http://www.usgyms.net/bars_skills.htm)
US Gym Net's glossary of dismounts (http://www.usgyms.net/tumbling_skills.htm)
(g) suspension of a modern uneven parallel bar arrangement in a fixed, static position at heights suitable for and appropriate to the performance of circus aerial acts utilizing the repertoire of moves and combinations of the gymnastics event for which the apparatus of this invention was developed.
When the high and low bars have noncircular cross-sections, as they often do, the attachment of the bar separation adjustment strut to the ends of the bars 10 and 12 must all be such that the long axes of the bar cross-sections and the bar-separation adjusting struts make the same acute angle of 45.degree..+-.10.degree.
To decrease the bar separation distance, the section(s) of the hydraulic cylinders on the opposite side(s) of the piston(s) are pressurized by manual or automatically controlled valves causing the piston(s) and end section(s) of the struts attached to the bar ends to retract.
In 1972 Olga Korbut pioneered the Korbut Flip, the first high bar salto release move; Nadia Comaneci continued the trend with her original Comaneci salto at the 1976 Olympics and advanced handstand elements four years later.