The Viking Battle IMO camp Danmark, Finland, Iceland (since 2015), Norway and Sweden The Viking Battle takes place at the camp for the IMO teams from Denmark, Finland, Norway and Swedes. It consists of two parts. The individual part: 4.5 hours. Three problems. Each problem is worth 7 points. The only tools allowed are paper and instruments for writing and drawing. The problems are chosen by the host country and are taken from the IMO shortlist from the previous year (or from publications, webpages, … which are not usually read by Scandinavian contestants, if there are not enough suitable problems in the shortlist). Level: easy IMO The group part: 4.5 hours. The IMO-team from each country works as a group. 16 problems, 4 in each of the subjects: algebra, combinatorics, geometry, and number theory. Each problem is worth 7 points. The only tools allowed are paper and instruments for writing and drawing. Each country selects problems in one subject. The subjects rotate every year. In 2013: Algebra: Denmark. Combinatorics: Finland. Geometry: Norway. Number theory: Sweden. In 2014: Algebra: Sweden. Combinatorics: Denmark. Geometry: Finland. Number theory: Norway. 2015 … The problems are chosen from publications, webpages, … which are not usually read by Scandinavian contestants. Level: In each subject the four problems are approximately on the levels: very easy IMO problem 1, easy IMO problem 1, IMO problem 1, IMO problem 2. Points and final score: The group of leaders present at the camp judges the answers. The final score of each country is the total score in both the individual and the group part. The team with the maximum total score wins. In case of a tie, there are two or more winners. The winners are called the Vikings. Organization: Every country prepares problems and solutions in English. The problems and solutions are sent to the host country (both tex and pdf) no less than two weeks before the camp starts. The problems are translated by the leaders of each country and are sent to the host country before the camp starts. The problem sets for each part in English, Danish, Finnish, Norwegian, and Swedish are gathered on a password-protected webpage with access only for leaders before the camp starts.