Chess Olympiad 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. In 2010, a FIDE official commented that due to the work of the FIDE Medical Commission, the tests were now considered routine. In November 2015, FIDE president Kirsan Ilyumzhinov announced they are working with WADA to define and
Chess Olympiad 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