Carl (Karl) Oscar Ahues (1883-1968) was a German International Master (1950). He was German champion in 1929. He was winning blitz chess tournaments in Germany in his 80s. His Elo rating was around 2490. His highest historical rating was 2651, ranked #11 in the world in 1931. He is the father of Herbert Ahues (1922- ) who became a Grandmaster for Chess Compositions in 1989.