[1] At the 38th Chess Olympiad in Dresden, Hammer represented Norway as the substitute player (number five on the team).

Hammer gained his first GM norm in the Cappelle-la-Grande Open in 2007, the second in Denmark in 2008, and a third in European Chess Club Cup later that year.

The short length of those tournaments, however, meant he needed a fourth norm to gain the GM title.

[3] This norm was achieved when Hammer won outright a jubilee tournament at Gjøvik arranged at the end of 2008 and the beginning of 2009.

[7] In 2011, Hammer suffered setbacks in the "B" section of the Tata Steel Chess Tournament, and the Aeroflot Open.