the Bowl Championship Series. For the first time, it included all major conferences (ACC, Big East, Big 12, Big Ten, Pac-10, and SEC) and all four major bowl games (Rose, Orange, Sugar and Fiesta). The champions of these six conferences, along with two "at-large" selections, were invited to play in the four bowl games. Each year, one of the four bowl games served as a national championship game. Also, a complex system of human polls, computer rankings, and strength of schedule calculations was instituted to rank schools. Based on this ranking system, the No.1 and No.2 teams met each year in the national championship game. Traditional tie-ins were maintained for schools and bowls not part of the national championship. For example, in years when not a part of the national championship, the Rose Bowl still hosted the Big Ten and Pac-10 champions. The system continued to change, as the formula for ranking teams was tweaked from year to year. At-large teams could be chosen from any of the Division I conferences, though only one selection—Utah in 2005—came from a BCS non-AQ conference. Starting with the 2006 season, a fifth game—simply called the BCS National Championship Game—was added to the schedule, to be played at the site of one of the four BCS bowl games on a rotating basis, one week after the regular bowl game. This opened up the BCS to two additional at-large teams. Also, rules were changed to add the champions of five additional conferences (Conference USA, the Mid-American Conference, the Mountain West Conference, the Sun Belt Conference and the Western Athletic Conference), provided that said champion ranked in the top twelve in the final BCS rankings, or was within the top 16 of the BCS rankings and ranked higher than the champion of at least one of the "BCS conferences" (also known as "AQ" conferences, for Automatic Qualifying). Several times after this rule change was implemented, schools from non-AQ conferences played in BCS bowl games, most notably Boise State in the 2007 Fiesta Bowl, in which they upset Oklahoma in overtime. In 2009, Boise State played TCU in the Fiesta Bowl, the first time two schools from BCS non-AQ conferences played each other in a BCS bowl game. The last team from the non-AQ ranks to reach a BCS bowl game was Northern Illinois in 2012, which played in (and lost) the 2013 Orange Bowl. College Football