<prompt> Christian Poswiat akaberekwa musi wa 26 Chikumi 1968 mutambi wekushambira wekuGermany uyo akahwina menduru mbiri dzebronze mu medley relays pa 1987 European Aquatics Championships  <response>: uye 1991 World Aquatics Championships. Akakwikwidzawo kumaOlympics ezhizha ra1988 na1992 mumakwikwi emamita zana uye mazana maviri; kubudirira kwake kukuru kwaive nzvimbo yechisere mumakwikwi emamita zana muna 1988. 