Stumpf was infamous for his role as the referee who by accusation manipulated the outcome of 22 March 1986 championship match between BFC Dynamo and 1. FC Lokomotive Leipzig which ended in a 1–1 draw that helped BFC Dynamo winning its eighth consecutive national title.
Stumpf was infamous for his officiating role in the 22 March 1986 championship game between BFC Dynamo and 1. FC Lokomotive Leipzig, where he allegedly influenced the outcome through accusations, leading to a 1–1 draw that helped BFC Dynamo secure its eighth consecutive national title.