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The Plus-One system is the current method of postseason play in the Football Bowl Subdivision (formerly Division I-A) of NCAA football in the United States. Plus-One employs a 4-team playoff consisting of two games, one more game than the Bowl Championship Series (BCS) system, which was used until the end of the 2013 season. The system first took effect at the conclusion of the 2014 season during the first College Football Playoff, which uses a Plus-One format. The BCS used a formula based on polls and computer rankings to assign teams to postseason games, known as bowl games. The teams that were ranked #1 and #2 nationally, according to the formula, were placed into the BCS National Championship, and the winner was crowned champion for that season. The BCS was a very divisive issue in college football. Opponents of the system argued that it was unfair to automatically assign teams to the National Championship, because it was impossible to determine the two top teams without some form of a playoff. BCS supporters argued that a playoff would minimize the importance of the regular season and would lessen the intensity of rivalry games, a staple of college sports, and that a playoff would be too time-consuming for student athletes who have scholastic obligations in addition to their athletic commitment. The Plus-One system has many variations, but essentially places the nation’s top four teams into a playoff to determine the National Champion. The system has supporters and detractors, but gained momentum during the 2011 offseason. ==Background== Created before the 1998 season, the BCS was intended to be an improvement over the previous postseason system because it would eliminate any doubt over which team deserved to be #1. Prior to the BCS, there was no official national championship game; instead, the coaches and writers constructed the final AP poll and Coaches Poll at the end of the season, and the #1 ranked team would be declared the National Champion. This often resulted in multiple teams tying for the championship. Beginning in 1998, four bowl games were declared to be BCS bowls: the Rose Bowl, the Orange Bowl, the Sugar Bowl, and the Fiesta Bowl. Six of the eight available slots for these games were filled by the winners of the Automatic-Qualifying conferences: the Big Ten, the Big East, the Pacific-12, the Southeastern Conference, the Big 12, and the Atlantic Coast Conference. There was also a clause that allowed Notre Dame, which does not belong to a conference, to attend a BCS game if they were ranked at least eighth nationally at the end of the regular season. From the 1998 season through the 2005 season, the National Championship game rotated between the four BCS bowls. Starting with the 2006 season, a fifth BCS bowl, the BCS National Championship, was added. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Plus-One system」の詳細全文を読む スポンサード リンク
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