2009 Chemos converted to steeplechase running in March 2009, after being introduced by her coach], the Olympic steeplechase medalist posted at KPC. She won her debut race, at the
Athletics Kenya meeting in
Kakamega, timing 9:54.4, and soon improved her PB to 9:22.33 at the
KBC Night of Athletics meeting in
Heusden-Zolder, Belgium. Dominguez was disqualified afterward for a doping violation.
2010 In 2010, Chemos won gold medals in the 3000 metre steeplechase at the
African Championships and the
Commonwealth Games, heading a Kenyan clean sweep of the medals in the latter. She also took
Diamond League victories in
Oslo,
Rome,
Eugene and
London, en route to capturing the overall Diamond League title in the steeplechase. As a result of her successes during the 2010 season, Chemos was one of five females shortlisted for the
IAAF World Athlete of the Year award, won by high jumper
Blanka Vlašić.
2011 Chemos entered the
2011 World Championships in
Daegu,
South Korea as favourite for the 3000 metres steeplechase, having won all five of the
Diamond League races in which she had competed prior to the championship. However, she was unable to improve upon her bronze medal of two years previous, finishing in third place, over 10 seconds behind race winner
Yuliya Zaripova. Chemos subsequently lost again to Zaripova at the final Diamond League meeting of the season – the
Memorial Van Damme in Brussels – but the Kenyan had already established an unbeatable lead in the Diamond Race standings and thus retained her title.
2012 At the start of 2012, Chemos ran at the
Cross de San Sebastián and was the runner-up behind
Nazareth Weldu. She began the
2012 IAAF Diamond League season in dominant fashion, winning the steeplechase in
Shanghai, Eugene and Oslo. At the third of these victories, Chemos broke the African 3000 metre steeplechase record of
Eunice Jepkorir, winning in a new personal best and Bislett Games record time of 9:07.14. In 2013, she won women's 3000m Steeplechase at the
World Athletics Championships, clocking in 9:36.16. ==Personal life==