Sergei Indeikin, an operational manager and delegate for the International Chess Federation (FIDE), has died at the age of 36 following a rapid decline in health shortly after returning from an official assignment in West Africa.

While FIDE officially attributed his death on August 23 to an undisclosed "sudden illness," family members and several Russian news outlets report that the official succumbed to a severe form of malaria contracted in Nigeria.

Indeikin traveled to Abuja, Nigeria, earlier this month to help manage the FIDE World Amateur Rapid and Blitz Chess Championships, which took place from August 1 to August 8.

According to reports from Russian newspaper Argumenty i Fakty (AIF), Indeikin subsequently traveled to Uzbekistan, where he first began experiencing health issues, before making his way back to his hometown of Perm via Moscow.

His condition worsened rapidly upon returning home. Speaking to Russian business daily RBC, Indeikin’s mother, Tatiana, confirmed that her son was hospitalized in Perm after his health severely deteriorated.

“It was a very rapidly progressing illness. The most severe form,” she told RBC, stating that he had contracted severe malaria while abroad.

Russian media outlets, including Lenta.ru, reported that Indeikin was believed to have been bitten by an infected mosquito during the Abuja tournament. Infectious disease expert Professor Alexander Lukashev noted in local press reports that tropical regions, including Nigeria, present a high risk for mosquito-borne malaria transmission.

Indeikin’s father, Alexander, added that details shared by his son’s FIDE colleagues also pointed toward malaria as the cause.

Despite hospitalization and emergency medical intervention in Perm, doctors were unable to save him.

Indeikin had been an integral part of FIDE’s operations team since 2021, assisting in the logistics and execution of major global events, including World Championship matches, Candidates tournaments, and World

Cups. FIDE remembered him as a dedicated staff member whose work required extensive international travel to ensure the smooth running of top-tier events.

Despite the statements from his family and regional press reports, FIDE has not independently confirmed malaria as the cause of death, maintaining its official stance that Indeikin passed away from a sudden illness.

He is survived by his wife and daughter.