the most matches together, with six games. Seven other pairs of teams have faced each other five times in the Challenge. With the exception of two years (2011–12), the imbalance of the number of teams in each conference result in up to three teams not playing. Nine games were scheduled for each of the first six challenges, leaving two teams from the 11-team Big Ten without an opponent. With the expansion of the ACC to 12 teams with the addition of Boston College, Miami, and Virginia Tech, the field was expanded to 11 games in 2006, meaning that one ACC team would not play. With Nebraska joining the Big Ten in 2011, the challenge expanded to 12 games and every member from both conferences participated. In 2013, Syracuse, Pittsburgh, and Notre Dame joined the ACC, leaving three ACC teams excluded from the competition. In 2014, Maryland withdrew from the ACC and joined the Big Ten along with Rutgers, giving that conference 14 teams, and Louisville joined the ACC replacing Maryland and maintaining the conference's 15-team membership. The conference realignments have thus led to the challenge being expanded to 14 games. When the challenge was expanded to 12 games, and later 14 games, the changes resulted in the possibility that the challenge could end in a tie. In the event of a tie, the previous year's winner retains the Commissioner's Cup. This scenario occurred most recently when the ACC retained the Cup in 2018 based on its 11–3 win in 2017, while the Big Ten retained the Cup in 2012 and 2013 based on its 8–4 win in 2011. Yearly results Team records The University of Maryland, College Park has a unique record in the Challenge, having competed for both sides after switching conferences in 2014. The Terrapins established a 10–5 record representing the ACC against Big Ten teams, but have since had a 2–7 record representing the Big Ten against ACC teams. Maryland's overall record is 12–12 but is listed below according to its relevant conference affiliations. Atlantic Coast Conference (13–8–3) Duke was the most successful team in either conference in Challenge competition by a large margin, holding a 20–4 record. Two other ACC schools (Virginia and Wake Forest) won more games in the Challenge than any Big Ten school. Seven ACC schools overall had winning records while two others have a .500 record. The column "Out" indicates the number