During the eighth round of the 2008 Corus chess tournament, Cheparinov was forfeited against Nigel Short because he refused (multiple times) to shake hands before his game. Short informed the arbiter, who had to be reminded of the rule, and the games was decided without a move.
FIDE’s behavioral norms state:
Any player who does not shake hands with the opponent before the game starts in a FIDE tournament or during a FIDE match (and does not do it after being asked to do so by the arbiter will immediately and finally lose the relevant game.
The reason for Cheparinov’s refusal was “some time ago in one of his interviews Mr. Short insulted him (Danailov) and our team gravely”. The Appeals Committee consisting of Vladimir Kramnik, Michał Krasenkow and Judit Polgár overturned the decision to forfeit the game on the condition that at Cheparinov should apologize to Short and that the game was to be replayed the next day – beginning with a handshake. Short ended up winning the game.