This successful string earned him an invitation to the tournament at Semmering–Baden 1937, which he won with 9/14 (+6−2=6), ahead of Fine, José Raúl Capablanca, Reshevsky, and Erich Eliskases. Keres, in his autobiographical games collection, refers to this major event as a 'Candidates' Tournament', and claimed that he was recognized as a Grandmaster after winning it, although its parallel connection with later FIDE-organized Candidates' tournaments (from 1950 onwards) is not exact, and the Grandmaster title was not formalized by FIDE until 1950.