Big 12 Conference football
The Big 12 Conference is a conference of 10 (originally 12) universities which participate in the National Collegiate Athletic Association's Division I Football Bowl Subdivision football. The conference was formed in 1994 but did not begin conference play until the fall of 1996. The schools that compose the Big 12 Conference, except West Virginia, were members of either the Big Eight Conference or the Southwest Conference, and have won 21 national titles including 3 titles since the inception of the Big 12 Conference. Realignment. In 2010 it was announced that in 2011 both Nebraska and  Colorado would leave the Big 12 for the Big Ten and Pac-10 respectively. Then in 2011 it was announced that Texas A&M and Missouri would both be leaving for the SEC. As replacements, TCU and West Virginia would be joining the conference from the Mountain West and Big East respectively. Scheduling. Divisions. From the time the league was formed until realignment, the conference was split into two, six team, divisions. Teams played a total of 11 regular season games, three non-conference match-ups and eight conference games per season. The conference games were a combination of five divisional foes  and three from the opposing division. Inter-divisional play is a "three-on, three-off" system, where teams will play three teams from the other division on a home-and-home basis for two seasons, and then play the other three foes from the opposite side for a two-year home-and-home. At the conclusion of the regular season, the top team from the South Division played the top team from the North Division in the Big 12 Championship Game. Round-robin. After the departure of Nebraska and Colorado, both the divisional format and the Championship Game were dropped . Members continue to play three non-conference opponents in addition to playing all nine other members of the conference on an annual basis. Starting again in 2017 the Championship Game was reinstated, the two teams with the highest conference winning percentage play in the game. Champions. Since its inception in 1996, the Big 12 championship has been won by nine different schools, three of which no longer belong to the conference. From 1996 to 2010, the championship was determined in the Big 12 championship game. Following the departures of two schools in 2010, the conference discontinued the championship game in  favor of a round-robin format to determine the champion. The University of Oklahoma Sooners have won the most championships with 14. Championship game. The Big 12 Championship Game was first held by the Big 12 Conference each year from 1996 until 2010 and again starting with the 2017 season. The original championship game pitted the Big 12 North Division champion against the Big 12 South Division champion in a game held after the regular season has been completed. The first championship game was held during the 1996 season in St. Louis. The 2009 and 2010 games were played at  Cowboys Stadium in Arlington, Texas. Following the departures of Nebraska and Colorado to the Big Ten and Pac-12 respectively, the Big 12 Championship Game was discontinued. Following an NCAA rule change in 2015 which allows conferences with fewer than 12 members to hold a championship game, the Big 12 elected to return to a postseason championship game to determine the conference champion. Following the completion of the round-robin regular season, the conference's top two teams compete in the championship game. Oklahoma defeated TCU 41–17 on December 2, 2017, in the first Big 12 Championship Game played since 2010 . Rivalries. Conference rivalries (primarily in football) mostly predate the conference. The Kansas-Missouri rivalry was the longest running, the longest west of the Mississippi and the second-longest in college football. It was played 119 times before Missouri left the Big 12. As of October 2012, the University of Kansas' athletic department had not accepted Missouri's invitations to play inter-conference rivalry games, putting the rivalry on hold. Sports clubs sponsored by the two universities continued to play each other. Current. Totals through the end of the 2017 season. Former members. Totals through the end of the 2011 season