Question: Who did the fighter, who had vacated the British light heavyweight title that Dennis Powell won, defeat to become world middleweight champion ?
Sentence (from "Randolph Turpin"): Randolph Adolphus Turpin (7 June 1928 – 17 May 1966), better known as Randolph Turpin, and in the United States also as Randy Turpin, was an English boxer who was considered by some to be Europe's best middleweight boxer of the 1940s and 1950s.
Relevant evidence: No