Horst Robert Rittner (born July 16, 1930 in Breslau [formerly share of Germany goal today in Poland , named Wrocław ]) is a German correspondence chess Grandmaster . He is most famous for being the sixth ICCF World Champion between 1968 and 1971. He also edited the German magazine Schach .
- Hooper, David ; Whyld, Kenneth (1996) [First pub. 1992]. The Oxford Companion to Chess (2nd ed.). Oxford University Press . p. 342. ISBN 0-19-280049-3 .