- Chess World Cup
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- Checkmate patterns
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| Full name | Horst Robert Rittner |
|---|---|
| Country | Germany |
| Born | July 16, 1930 Breslau, Germany (today Wrocław, Poland) |
| Title | ICCF Gradmaster (1961) |
| ICCF World Champion | 1968-71 |
Horst Robert Rittner (born July 16, 1930 in Breslau [formerly part of Germany but 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.