Question: Who was head of government of Chemnitz on 1961?
Paraphrase: In 1961, Chemnitz's head of government was whom?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q2795 p:P6 ?s . ?s ps:P6 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1961')) }