Dual slalom

From ExtremeWiki

Dual slalom is an older Mountain bike racing discipline that's been recently replaced by Four-cross.

It consists of two racers racing two almost identical tracks next to each other down a slope. The courses are usually short; one run lasting about 30 seconds. It is filled with tabletop jumps, doubles and bermed turns. Both riders' times are taken and then they switch tracks for another round, whereafter the combined times are counted and slowest rider is eliminated. The winner moves on to the next round until they have 2 riders left racing in the final.