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Interzonal chess tournaments were tournaments organized by the World Chess Federation
FIDE The International Chess Federation or World Chess Federation, commonly referred to by its French acronym FIDE ( , ), is an international organization based in Switzerland that connects the various national chess federations and acts as the Spor ...
from the 1950s to the 1990s. They were a stage in the triennial
World Chess Championship The World Chess Championship is played to determine the world champion in chess. The current world champion is Gukesh Dommaraju, who defeated the previous champion Ding Liren in the World Chess Championship 2024, 2024 World Chess Championship. ...
cycle and were held after the Zonal tournaments, and before the Candidates Tournament. Since 2005, the
Chess World Cup The FIDE World Cup is a major chess event organized by FIDE, the international governing body. History Three different formats have been used: *In 2000 and 2002, it was a multi-stage tournament, with a group stage consisting of 24 players in fo ...
has filled a similar role.


Zonal tournaments

In the first year of the cycle, every FIDE member nation would hold a national championship, with the top players qualifying for the Zonal tournament. The world was divided into distinct zones, with the
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, the
United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...
and
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each being designated a zone, thus qualifiers from these three zones went directly to the Interzonal. Smaller countries would be grouped into a zone with many countries. For example, all of
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and
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combined originally formed one zone.


Interzonal tournaments

The top players in each Zonal tournament would meet in the Interzonal tournament, which would typically have between 20 and 24 players. The top finishers (e.g., the top six in 1958) would qualify for the Candidates Tournament, which would take place the following year. They would be joined in the Candidates by the loser of the previous candidates' final and the loser of the previous world championship match. The winner of the Candidates tournament would play a 24-game match with the World Champion the following year, and need to win outright to gain the title. For instance, in the
World Chess Championship 1963 At the World Chess Championship 1963, Tigran Petrosian narrowly qualified to challenge Mikhail Botvinnik for the World Chess Championship, and then won the match to become the ninth World Chess Champion. The cycle is particularly remembered for ...
cycle, nine different Zonals were played. Each qualified between one and four players for the Interzonal, depending on the strength of the region, with 23 players qualifying for the Interzonal. The Interzonal was played in January to March 1962, with the top six players qualifying for the Candidates. They were joined by
Mikhail Tal Mikhail Tal (9 November 1936 – 28 June 1992) was a Soviet and Latvian chess player and the eighth World Chess Champion. He is considered a creative genius and is widely regarded as Comparison of top chess players throughout history, one ...
(loser of the 1961 match for the championship with
Mikhail Botvinnik Mikhail Moiseyevich Botvinnik (; ;  – May 5, 1995) was a Soviet and Russian chess grandmaster who held five world titles in three different reigns. The sixth World Chess Champion, he also worked as an electrical engineer and computer sci ...
), and
Paul Keres Paul Keres (; 7 January 1916 – 5 June 1975) was an Estonian chess grandmaster and chess writer. He was among the world's top players from the mid-1930s to the mid-1960s, and narrowly missed a chance at a World Chess Championship match on five ...
, who had finished second at the 1959 Candidates tournament. Those eight played a quadruple round-robin in the Candidates tournament in May and June 1962. The winner was Tigran Petrosian, who then played Botvinnik in a match for the championship in 1963. Thus, Interzonal tournaments were held approximately every three years from 1948 until 1993 (1948, 1952, 1955, 1958, 1962, 1964, 1967, 1970, 1973, 1976, 1979, 1982, 1985, 1987, 1990, and 1993). However, by 1972 the system was becoming unwieldy. The number of top-level players had grown, with the increasing popularization of chess, and the cost of staging these events had become too great. It had become impractical to put all of the top players into a round robin tournament, so in 1973 the system was changed to two Interzonals (with the first three in each qualifying for the Candidates). In 1982 it changed again to three Interzonal tournaments, where the top two players qualified from each. Further increases in the number of qualifiers led to the Interzonal being staged as a single
Swiss system tournament A Swiss-system tournament is a non-eliminating tournament format that features a fixed number of rounds of competition, but considerably fewer than for a round-robin tournament; thus each competitor (team or individual) does not play all the other ...
in 1990 and 1993. The last
FIDE The International Chess Federation or World Chess Federation, commonly referred to by its French acronym FIDE ( , ), is an international organization based in Switzerland that connects the various national chess federations and acts as the Spor ...
Interzonal was in 1993. The short-lived Professional Chess Association also held one Interzonal, in 1993.


Chess World Cup

The system was dropped altogether from the mid-1990s, being replaced by a series of short, knockout-style matches among qualifiers. From 1998 to 2004, these tournaments were for the
FIDE The International Chess Federation or World Chess Federation, commonly referred to by its French acronym FIDE ( , ), is an international organization based in Switzerland that connects the various national chess federations and acts as the Spor ...
World Championship. Since 2005, the
Chess World Cup The FIDE World Cup is a major chess event organized by FIDE, the international governing body. History Three different formats have been used: *In 2000 and 2002, it was a multi-stage tournament, with a group stage consisting of 24 players in fo ...
has filled a somewhat similar role to the Interzonal. As with the Interzonals, players qualify via zonal tournaments, although some leading players are seeded directly into the World Cup. The winner (and sometimes also the runner-up) qualifies for the Candidates Tournament. (In contrast to the Interzonal, from which six or more players would qualify).


See also

See Candidates Tournament for a table of Interzonal, Candidates and World Championship results since 1948.


References


External links


Mark Weeks' World Chess Championship Index
{{Authority control World Chess Championships