FIDE, as a sports federation recognized by the IOC, and particularly as a signatory to the World Anti-Doping Agency (WADA) conventions, adheres to their rules, including a requirement for doping tests, which they are obliged to take at the events such as the Olympiad. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ Research carried out by the Dutch chess federation failed to find a single performance enhancing substance for chess.<unk> Research carried out by the Dutch chess federation failed to find a single performance enhancing substance for chess.<unk> 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".<unk> 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". ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ ️<unk>️<unk>️<unk>️<unk>️<unk>️ ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ 4 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. (<unk> 38th Chess Olympiad in 2008, with a procedural error being indicated instead.)