International chess federation

1946 to 1993
Birth of the World Championship challenge cycle[edit]
From the time of Emanuel Lasker's defeat of Wilhelm Steinitz in 1894, until 1946, a new World Champion had won the title by defeating the former champion in a match. Alexander Alekhine's death created an interregnum that made the normal procedure impossible. The situation was confused, with many respected players and commentators offering different solutions. FIDE found it difficult to organize the early discussions on how to resolve the interregnum, because problems with money and travel in the aftermath of World War II prevented many countries from sending representatives, most notably the Soviet Union. The shortage of clear information resulted in otherwise responsible magazines publishing rumors and speculation, which only made the situation more confused.^[21] See Interregnum of World Chess Champions for more details.
This situation was exacerbated by the Soviet Union having long refused to join FIDE, and by this time it was clear that about half the credible contenders were Soviet citizens. The Soviet Union realized, however, it could not afford to be left out of the discussions regarding the vacant world championship, and in 1947 sent a telegram apologizing for the absence of Soviet representatives and requesting that the USSR be represented in future FIDE Committees.^[21]
The eventual solution was similar to FIDE's initial proposal and to a proposal put forward by the Soviet Union (authored by Mikhail Botvinnik). The 1938 AVRO tournament was used as the basis for the 1948 Championship Tournament. The AVRO tournament had brought together the eight players who were, by general acclamation, the best players in the world at the time. Two of the participants at AVRO—Alekhine and former world champion Capablanca—had since died; but FIDE decided that the other six participants at AVRO would play a quadruple round-robin tournament. These players were: Max Euwe (from The Netherlands); Botvinnik, Paul Keres and Salo Flohr (from the Soviet Union); and Reuben Fine and Samuel Reshevsky (from the United States). FIDE soon accepted a Soviet request to substitute Vasily Smyslov for Flohr, and Fine withdrew in order to continue his degree studies in psychiatry, so five players competed, in a quintuple round robin. Botvinnik won, thus becoming world champion, ending the interregnum.^[21]
The proposals which led to the 1948 Championship Tournament also specified the procedure by which challengers for the World Championship would be selected in a three-year cycle: countries affiliated with FIDE would send players to Zonal tournaments (the number varied depending on the number of strong players each country had); the players who gained the top places in these would compete in an Interzonal tournament (later split into two, then three tournaments as the number of countries and eligible players increased^[22]); the highest-placed players from the Interzonal would compete in the Candidates Tournament, along with the loser of the previous title match and the runner-up in the previous Candidates Tournament; and the winner of the Candidates played a title match against the champion.^[21] From 1950 until 1962 inclusive, the Candidates Tournament was a multi-round round-robin—how and why it was changed are described below.