 Complete the following phrase:  After Horváths retirement in 1998, Kolonics started to focus on the singles and at the 2000 Summer Olympics he won the C-1 500 m gold medal. Afterwards he returned to doubles again, teaming up with the younger György Kozmann. The pair won a bronze medal at the 2004 Summer Olympics in C-2 1000 m, and a gold medal at both the 