What is {chairperson} of {FIDE} that is {end time} is {1949-1-1} ?
Who was the chairperson of FIDE on January 1, 1949?
Who was the chairperson of FIDE as of 1-1-1949?
SELECT ?i WHERE { FILTER ( CONTAINS ( YEAR ( ?o ) , '1949' ) ) . ?e property:end_time ?o . resource:FIDE property:chairperson ?e . ?e property:chairperson ?i }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q102178> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P488> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P582> <1949-1-1>
} 

SELECT ?obj WHERE { wd:Q102178 p:P488 ?s . ?s ps:P488 ?obj . ?s pq:P582 ?x filter(contains(YEAR(?x),'1949')) }