by Gorshkov at Odintsovo FSC, near Moscow. 2009–2010 season: Debut of Riazanova/Tkachenko Riazanova/Tkachenko began competing together during the 2009–2010 season. They finished fourth at the 2009 Nebelhorn Trophy, sixth at their sole Grand Prix event, the 2009 Cup of Russia, and fourth at the Russian Nationals. 2010–2011 season Riazanova/Tkachenko decided to scrap the free dance they had planned for the 2010–2011 season and prepare a new one. They placed fifth at their first Grand Prix event of the season, the 2010 Skate America, and then won silver at the 2010 Trophée Eric Bompard. At the 2011 Russian Nationals, they won the silver medal and their first berth to the European Championships. At the 2011 Europeans, Riazanova/Tkachenko placed fifth in the short dance, sixth in the free dance, and sixth overall. Russia had only two spots to the World Championships and since both Bobrova/Soloviev and Ilinykh/Katsalapov had placed ahead of them at Europeans, they did not make the team, however, they continued training as first alternates and also worked on new programs until the end of May; after vacation, they resumed training for the new season on 20 June, including a three-week camp in Bulgaria. 2011–2012 season For the 2011–2012 season, Riazanova/Tkachenko were assigned to 2011 Skate Canada and 2011 Cup of Russia as their Grand Prix events. On their free dance, which was choreographed by Sergei Petukhov, Riazanova said, "A young woman remembers her beloved, who is no longer alive. She is so deeply immersed in the memories of happy times that her dreams seem to become reality for a short while." They had to withdraw from 2011 Nebelhorn Trophy because Tkachenko's new passport was not ready. On 13 December 2011 Riazanova sustained a concussion and a broken nose when Tkachenko accidentally elbowed her in practice; she was released from hospital at her own risk on 20 December At the Russian Championships which began on December 25, Riazanova/Tkachenko won the bronze medal after placing third in the short dance and fourth in the free dance. They finished 5th overall at the 2012 European Championships but received a small bronze medal for their 3rd place in the short dance. They finished 9th at the 2012 World Championships. 2012–2013 season In April 2012, Tkachenko said that they would spend some time preparing for the following season in Marina Zueva and Igor Shpilband's group in the United States, however, the coaches parted ways