 Complete the following phrase:  From 1982 Schulz boxed for the army sports club Vorwärts in Frankfurt Oder, later becoming the East German youth champion. From 1986 onward, he was a Stasi informer under the codename Markus. At the junior European championships in Denmark in 1986, Schulz won the light-heavyweight title, and in 1988, under the tutelage of Manfred Wolke, he became East German heavyweight champion. In 1989 he won the Chemiepokal in Halle Saale, the silver medal at 