If groups complete stage on factors while in the 17th and 18th positions, a two-legged playoff decides which group remains in Serie A. The team with the greater head-to-head history hosts the 2nd leg. Despite endeavours to keep up consistency, these versions include a component of unpredictability to Serie A, https://7m-ma-cao31974.thezenweb.com/how-many-rounds-are-there-in-serie-a-for-dummies-77218270