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The 2005–06 Campionato Sammarinese di Calcio season is its twenty-first since its establishment. The top three clubs from each girone will compete in a playoff tournament. The winner will qualify for the first qualifying round of the UEFA Cup next season. This season marks the final season that the winner of the playoffs qualifies for the UEFA Cup. From next season on, the winner of the playoffs will qualify for the first qualifying round of the UEFA Champions League.
Source: Legend: Blue = home team win; Yellow = draw; Red = away team win. Notes:
The match between Fiorentino and Pennarossa in the 1st round (originally finished 0–0) was rated 0–3 for Pennarossa because of the use of an ineligible player.
Play-off
First round
The second place club will play the third place club from the opposite group.