GM Veselin Topalov is a Bulgarian super-grandmaster and was the FIDE world champion in 2005. He was the world number-one player from April 2006 through January 2007 and again from October 2008 until January 2010. According to 2700chess.com, he reached his peak rating of 2826 on August 24, 2015—the 5th highest rating of all time. Source: Chess.com
