Career
He started playing in the chess club Hamburg Saskatchewan, where he still continues to be a member. He plays in the German Chess Bundesliga since 1997. In year 1999 he was appointed FIDE International Master, and earned the title grandmaster in 2003.
He was nominated to the German national team in 2002, due to merits gained in a match with Greece, and in 2004 he represented Germany in the 2004 Chess Olympiad at Calvià.
Gustafsson is one of the strongest German chess players, and finished second in the 2004 and 2005 German championships. He is also considered a very strong blitz chess player, winning the German blitz championship in 2001.
His handle on the Internet Chess Club is "GodGusti". His top Elo rating is 2652, recorded in November 2010 until January 2011.
He occasionally plays a lot of poker, and has written a book on poker together with Dutch professional poker player Marcel Lüske.
Gustafsson is involved in Chess24.com project, in which he makes video analyses of notable chess games. He has been named by the chess historian Edward Winter as one of the top five Internet broadcasters.