[['year', "men 's singles", "women 's singles", "men 's doubles", "women 's doubles", 'mixed doubles'], ['1988', 'kim brodersen', 'katrin schmidt', 'markus keck robert neumann', 'katrin schmidt nicole baldewein', 'markus keck katrin schmidt'], ['1989', 'sörgard', 'katrin schmidt', 'stefan frey robert neumann', 'birgitta lehnert monica halim', 'chen jin katrin schmidt'], ['1998', 'yong yudianto', 'karolina ericsson', 'michael keck christian mohr', 'erica van den heuvel judith meulendijks', 'michael keck nicol pitro'], ['1999', 'oliver pongratz', 'zheng yaqiong', 'quinten van dalm dennis lens', 'britta andersen lene mork', 'chris bruil erica van den heuvel'], ['2000', 'xie yangchun', 'xu huaiwen', 'michael søgaard joachim fischer nielsen', 'claudia vogelgsang xu huaiwen', 'michael keck erica van den heuvel'], ['2001', 'niels christian kaldau', 'pi hongyan', 'michael søgaard michael lamp', 'neli boteva elena nozdran', 'chris bruil lotte bruil - jonathans'], ['2002', 'chen gang', 'pi hongyan', 'simon archer flandy limpele', 'mia audina lotte bruil - jonathans', 'nathan robertson gail emms'], ['2003', 'dicky palyama', 'xu huaiwen', 'michał łogosz robert mateusiak', 'nicole grether juliane schenk', 'frederik bergström johanna persson'], ['2004', 'niels christian kaldau', 'xu huaiwen', 'simon archer anthony clark', 'kamila augustyn nadieżda kostiuczyk', 'rasmus mangor andersen britta andersen'], ['2005', 'kasper ødum', 'xu huaiwen', 'tony gunawan halim haryanto', 'nicole grether juliane schenk', 'vladislav druzhchenko johanna persson'], ['2006', 'ronald susilo', 'xu huaiwen', 'michał łogosz robert mateusiak', 'jiang yanmei li yujia', 'robert mateusiak nadieżda kostiuczyk'], ['2007', 'lu yi', 'wang yihan', 'mathias boe carsten mogensen', 'yang wei zhang jiewen', 'kristof hopp birgit overzier'], ['2008', 'chetan anand', 'maria febe kusumastuti', 'mathias boe carsten mogensen', 'helle nielsen marie roepke', 'diju valiyaveetil jwala gutta'], ['2009', 'jan ø jørgensen', 'juliane schenk', 'rupesh kumar sanave thomas', 'helle nielsen marie roepke', 'mikkel delbo larsen mie schjoett - kristensen'], ['2010', 'chen long', 'liu xin', 'mathias boe carsten mogensen', 'pan pan tian qing', 'zhang nan zhao yunlei'], ['2011', 'hans - kristian vittinghus', 'li xuerui', 'bodin isara maneepong jongjit', 'mizuki fujii reika kakiiwa', 'chan peng soon goh liu ying'], ['2012', 'chou tien - chen', 'juliane schenk', 'ingo kindervater johannes schoettler', 'wang rong zhang zhibo', 'anders kristiansen julie houmann'], ['2013', 'chou tien - chen', 'nichaon jindapon', 'mads conrad - petersen mads pieler kolding', 'eefje muskens selena piek', 'michael fuchs birgit michels']]
Katrin Schmidt played with both Markus Keck and Chen Jin in the Mixed Double
[ENT] played with both [ENT] and [ENT] in the [ENT]