Otto Rüster (Ruester, Ruster) (1895–??) was a German chess master.
He represented Germany in 2nd unofficial Chess Olympiad at Budapest 1926. He played several times in Silesian Chess Congress,Chess In Former German, Now Polish Territories - Fred Van Der Vliet and won at Breslau 1925 (the 4th SCC). After World War II, he lived in East Germany, and played at Jena 1953 (the 4th GDR-ch).
Before and after the war, he participated in many correspondence chess tournaments.
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