In July 2008 in Berlin , a 19-year old Russian mathematics student Nikolai Sazhin won the '' World Champion '' title in chess boxing by defeating Frank Stoldt .
In July 2008 in Berlin , a 19-year old Russian mathematics student Nikolai Sazhin won the title of '' World Champion '' in chess boxing by beating Frank Stoldt .
In July 2008 in Berlin , a 19-year old Russian mathematics student Nikolai Sazhin won the title of '' World Champion '' in chess boxing by beating Frank Stoldt .
이 텍스트를 덜 복잡하게 만들기: In July 2008 in Berlin , a 19-year old Russian mathematics student Nikolai Sazhin won the '' World Champion '' title in chess boxing by defeating Frank Stoldt . 산출: