The chess federation accuses a former champion of harassing a rival who died

Russian chess grandmaster Vladimir Kramnik, right, concentrates during a February 2015 game against U.S. grandmaster Lewon Aronjan during the Zurich Chess Challenge.

The game's governing body has filed a complaint against Vladimir Kramnik. Other players say he spent months making unproven allegations of cheating against Daniel Naroditsky, who died last month.

(Image credit: Ennio Leanza)