Career
In 1922, he took 2nd, behind Erhardt Post, in Bad Oeynhausen (22nd Dictionary of Scientific Biography–Congress). Carls represented Germany in Chess Olympiads:
1st Chess Olympiad at London 1927 (+7 –3 =5);
3rd Chess Olympiad at Hamburg 1930 (=6 –1 =7);
3rd unofficial Chess Olympiad at Munich 1936 (+5 –2 =10). Carls was awarded the International Master title in 1951.