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 li

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