In March 1975, ten shareholders founded the Gustav Jaenecke KG to run a casino in former West Berlin. The concession was granted to them in October and the gaming operation could kick off. Jaenecke himself was a multi-talented sportsman. Having won silver and bronze medals at the world championships, a European championship and 13 German championship titles, he is one of the most successful German ice hockey players. But also in tennis he was an exceptional talent, being the German champion of 1932 and playing together with Gottfried von Cramm, a triple finalist in Wimbledon.