Question: For which games are Sam Loyd and Eric Schiller both famous?
SPARQL:
SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Sam_Loyd> <http://dbpedia.org/ontology/knownFor> ?uri. <http://dbpedia.org/resource/Eric_Schiller> <http://dbpedia.org/ontology/knownFor> ?uri . }