What is {partner} of {Amy Winehouse} that is {start time} is {2010-1-1} ?
who is partner of Amy Winehouse that has start time is 2010-1-1 ?
SELECT ?obj WHERE { wd:Q15897 p:P451 ?s . ?s ps:P451 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'2010')) }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q15897> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P451> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P580> <2010-1-1>
} 

Who was Amy Winehouse partner on Jan 1st 2010