Here’s a video of the 2013 World Yo-Yo Contest winner, Janos Karancz. His motion is so delicate and intricate, it’s almost like he’s doing needlepoint or something:
Contrast that with the winner of the 2000 World Yo-Yo Contest, Yu Kawada. Much simpler tricks, more showmanship, like it’s a dance:
Here’s some footage from a 1989 yo-yo contest. Lots of throwing tricks and fewer spinning tricks. Contestants competed in blazers!
And finally, a Duncan yo-yo commercial from 1976. Super simple tricks and more blazers!