The Chess Olympiad is a biennial chess tournament in which teams from all over the world compete. FIDE organises the tournament and selects the host nation.
The use of the name "Chess Olympiad" for FIDE's team championship is of historical origin and implies no connection with the Olympic Games.
The first Olympiad was unofficial. For the 1924 Olympics an attempt was made to include chess in the Olympic Games but this failed because of problems with distinguishing between amateur and professional players. While the 1924 Summer Olympics was taking place in Paris, the 1st unofficial Chess Olympiad also took place in Paris. FIDE was formed on Sunday, July 20, 1924, the closing day of the 1st unofficial Chess Olympiad.
FIDE organised the first Official Olympiad in 1927 which took place in London. The Olympiads were occasionally held annually and at irregular intervals until World War II; since 1950 they have been held regularly every two years.
Chess is not recognized as a sport by the International Olympic Committee (IOC); since June 1999 FIDE has been recognized by the International Sports Federation.
As a sporting federation recognized by the IOC, and particularly as a signatory to the World Anti-Doping Agency (WADA) conventions, FIDE adheres to their rules, including a requirement for doping tests, which they are obligated to take at the events such as the Olympiad. The tests were first introduced in 2002 under significant controversy, with the widespread belief that it was impossible to dope in chess. Research carried out by the Dutch chess federation failed to find a single performance-enhancing substance for chess. According to Dr Helmut Pfleger, who has been conducting experiments in the field for around twenty years, "Both mentally stimulating and mentally calming medication have too many negative side effects". Players such as Artur Yusupov,Jan Timman and Robert Hübner either refused to play for their national team or to participate in events such as the Chess Olympiad where drug tests were administered. All 802 tests administered at the 2002 Olympiad came back negative. However, in the 36th Chess Olympiad in 2004, two players refused to provide urine samples and had their scores cancelled. Four years later, Vassily Ivanchuk was not penalized for skipping a drug test at the 38th Chess Olympiad in 2008, with a procedural error being indicated instead.