 Complete the following phrase:  Yelena Anatolyevna Tkach also Elena Tkach, ; born 19 May 1970 in Kopeysk, Russian SSR, Soviet Union is a Russian sport shooter. Representing the former Soviet Union, Tkach won a silver medal in the womens double trap at the 1991 ISSF World Shooting Championships in Perth, Australia, with a total score of 121 clay pigeons. She also defeated Lithuanias Daina Gudzinevičiūtė by one point for the gold medal in the womens trap at the 