Race horses whose grandsire is Wild Risk have taken part in which races?
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/grandsire> <http://dbpedia.org/resource/Wild_Risk> . ?x <http://dbpedia.org/property/race> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/RaceHorse>}
Wild_Risk