PYEONGCHANG, South Korea — An instant after completing her run in Saturday’s Olympic women’s super-G, Ester Ledecka of the Czech Republic stood motionless in the snow as she gazed at the scoreboard where her name was atop the list of finishers.

She shook her head side to side, convinced that what she saw was a mistake or a timing glitch. Professional snowboarders racing on hand-me-down skis do not win gold medals in ski events at the Winter Olympics.

“I thought they were going to put a couple more seconds on my time,” Ledecka later said, laughing and well aware that the race would be decided by hundredths of a second. “I was waiting for it.”

Ledecka came to the Pyeongchang Games planning to make history as the first person to compete at the Olympics in both skiing and snowboarding. Instead, she crashed the Alpine party at the women’s super-G with an astonishing upset victory.