Question: Reima Juhani Karppinen won a silver medal at what event that was held from August 30 to September 6 in 1981, at Oberschleibheim, outside Munich, Germany?
Sentence (from "Reima Karppinen"): In this event, he won a silver medal at the 1981 World Rowing Championships, together with his legendary brother Pertti.
Relevant evidence: Yes