As the World War ended in early September 1945, Fine was 30 years of age, and working on his doctorate in psychology. After World Champion Alekhine died in March 1946, FIDE (the World Chess Federation) organized a World Chess Championship tournament to determine the new champion. Alekhine was the first champion to die as title-holder, creating an unprecedented problem. As co-winner in the AVRO tournament, Fine was invited to participate, but he declined, for reasons that are the subject of speculation even today. Fine had played a third match against Herman Steiner at Los Angeles 1947, winning 5–1; this match was training for his potential world championship appearance.