Top competition climber Chaehyun Seo has just climbed La Rambla 5.15a in Siurana, Spain. The steep route took her only five days and seven tries. She’s now set her sights on Biographie 5.15a in Céüse. Seo has been one of the most formidable climbers on the World Cup circuit, often making finals and even besting Olympic gold medalist Janja Garnbret. She onsighted 5.13b at 11 years old, sent Omaha Beach in 2016 for her first 5.14a and then sent Bad Girls Club 5.14+ at 15. She’s taken home four straight World Cup gold medals and won the World Championships last…