premise: China and Russia split the two gold medals on offer as Liu Chunhong and Zarema Kasaeva won the women's 75kg and 69kg category respectively at the World Weightlifting Championships here on Sunday.
  European champion Zarema Kasaeva beat Liu Haixia of China to win the women's 69kg category while breaking the world record of the jerk.
  Olympic champion Liu Chunhong, shifting from 69kg to 75kg after the Games, confirmed her supremacy as she beat strong challenge from Russian weightlifters to win the gold medal with a world-record-breaking result at 285kg.
  European Champion Natalia Zabolotnaya of Russia and her compatriot Svetlana Podobedova challenged Liu from the very beginning of the competition, but the 20-year-old strongwoman showed her calmness to hoist 126kg in the snatch, 4kg less than Podobedova's and jerked 159kg, 4kg more than the Russians.
  Both having a total result of 285kg, Liu won the gold medal due to the body weight advantage.
   What caused Liu to win the gold medal despite of having the same result as the Russian?
hypothesis: body weight advantage