In 1977 Tkachev performed for the first time a gymnastics element on the Horizontal Bar, which was later named Tkachev after him and became one of the most popular and impressive elements, frequently used on international gymnastics competitions.
Godine 1977., Tkačjov izvodi po prvi put u gimnastici novi element na preči, koji je kasnije nazvan po njemu Tkačjov i postao je jedan od najpopularnijih i najimpresivnijih elemenata, često se koristi u međunarodnim gimnastičkim natjecanjima.