Rubuta ci gaba don wannan sakin layi - An haife shi a watan Satumbar 1963, Hertneck ya lashe gasar zakarun Jamus U16 Chess a 1980. Ya sami lambar yabo ta kasa da kasa a shekarar 1985 da kuma lambar yabo ta Grandmaster a 1991. Ya fafata ne a Jamus ta Yamma a Gasar Cin Kofin Duniya ta Teamungiyar Chess ta 1985, inda ya ci 2/5 (+ 0<unk>1 = 4). Ya kuma wakilci Jamus a gasar Olympics ta Chess biyu (1992
da 1994), da kuma gasar zakarun Turai ta Team Chess (1992 da 2001). Sakamakonsa na gaba ɗaya na Olympiad shine 121⁄2/20 (+ 8 <unk> 3 = 9}, kuma jimlarsa ta gaba ɗaya na Gasar Zakarun Turai ita ce 71⁄2/14 (+ 5 <unk> 4 = 5). Matsayin sa na Elo na 2615, wanda aka saita a watan Janairun 1994, ya sanya shi dan wasa mai lamba 32 a duniya.