Ka cika wannan jumla: An haife shi a shekara ta 1966, Danielsen ya sami babban matsayinsa a shekara ta 1996. A cikin 1993, ya gama na farko a cikin Kofin Politiken tare da Igor Khenkin da John Emms a kan maki 71⁄2/10. Ya taka leda a gasar Olympics ta Chess guda shida: uku ga Denmark (1992, 1994 da 1995)
1996); uku don Iceland (2006, 2008 da 2012). Shi ne dan wasa na 4 na Icelandic a watan Satumbar 2020.