By Julien Pretot

PARIS (Reuters) -Former world chess champion Vladimir Kramnik has asked Swiss authorities to investigate threatening messages posted online since the sudden death of U.S. grandmaster Daniel Naroditsky, according to a copy of the filing seen by Reuters on Sunday.

Kramnik, who raised questions about possible cheating by Naroditsky and other players last year, is facing disciplinary proceedings over public attacks on the American, a popular streamer and commentator who died earlier this month aged 29. The cause of his death has not been disclosed.

In a nine-page complaint submitted to the Geneva public prosecutor on October 25, Kramnik said he and his family had received “hundreds of terrifying private messages and public comments” on social media, many of them calling for

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