Chess's international governing body said Tuesday that it filed a complaint against former World Chess Champion Vladimir Kramnik after he leveled unproven allegations of cheating against fellow players, including Daniel Naroditsky, who died last month at age 29.

The complaint centers on harassment and "the insulting of an individual's dignity," said the International Chess Federation, known by the acronym FIDE, in a news release.

Naroditsky's cause of death has not been made public.

Kramnik accused Naroditsky, an American grandmaster of cheating last year and continued to share suspicions on social media.

Naroditsky, a prodigious chess player who helped usher in the game's online boom with educational YouTube videos and livestreams, denied the allegations.

In his last livestream befor

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