The 2009-10 modus was somewhat different from the previous season. The competition had been expanded from nine to ten teams. It marks the first time since introduction of the single-division Bundesliga in 2001, that ten teams competed in the league. This change of modus was decided upon on 19 July 2008 at the annual general meeting of the German rugby association, the
DRV. It was decided to expand the league to ten teams for 2009-10. It was also then decided to introduce an extended play-off format. All up, the number of season games in the Rugby-Bundesliga increases to 94 from 76. Like in 2008-09, the top four teams qualified for the finals. The two semi-finals winners then contested the championship final. At the bottom end of the table, nominally the last two teams were relegated while the
2nd Rugby-Bundesliga champions are promoted, however, this was subject to the 2nd Bundesliga champions accepting promotion, which was not the case. The defending champion in 2009-10 was SC 1880 Frankfurt, who beat
Heidelberger RK in the 2008-09 final while the
ASV Köln Rugby and
DSV 78 Hannover were newly promoted to the league, having replaced the
DRC Hannover. Suffering from a string of injuries, especially to its forward line, and heavy defeats during the season, ASV Köln Rugby made the decision in mid-April 2010, to withdraw from the Rugby-Bundesliga and not to play its five remaining matches.
Köln thereby was automatically relegated from the league. In the 2nd Bundesliga, the winners of the two divisions were nominally promoted to the Bundesliga, unless they were reserve teams, in which case the right for promotion would have gone to the next-best non-reserve team. The bottom two teams in the 2nd Bundesliga faced the prospect of relegation to the
Rugby-Regionalliga. In the South/West Division, the
Karlsruher SV Rugby withdrew in March 2010, its record being expulsed. As a sign of the gap between the Bundesliga and the 2nd Bundesliga,
TSV Victoria Linden, who only won the 2009-10 North/East division in the last round of the championship, declined promotion, citing the additional cost of travelling and the limited player pool as their reason. The South/West champion,
Stuttgarter RC, has also indicated that it would not take up promotion because of the loss of eight first-team players at the end of the season, leaving the Bundesliga with only eight clubs for the next season. It also meant, for the first time ever, that no club from
Hanover would compete at the top level of German rugby.
DSV 78 protested the decision to reduce the league to eight teams again and thereby relegating the club. For the 2nd Bundesliga, this also meant, only one team each would be promoted to the two regional divisions, in the North/East, this was
SC Siemensstadt, the club being directly promoted, while, in the South/West,
TV Pforzheim won the promotion tournament of the five southern Regionalliga champions in
Nuremberg on 12 June 2010. ==Bundesliga table==