If there is a three way tie in the Big XII South the BCS rankings would decide who plays in the Championship game. Here's the article from the Big XII website:
http://www.big12sports.com/ViewArticle.dbml?DB_OEM_ID=10410&ATCLID=1546006
1. The records of the three teams will be compared against each other EACH WOULD BE 1-1 AGAINST THE OTHER TWO.
2. The records of the three teams will be compared within their division EACH WOULD BE 4-1 IN DIVISION
3. The records of the three teams will be compared against the next highest placed teams in their division in order of fi nish (4, 5 and 6) EACH WOULD BE 3-0 AGAINST THOSE TEAMS
4. The records of the three teams will be compared against all common conference opponents; EACH WOULD BE 7-1
5. The highest ranked team in the fi rst Bowl Championship Series Poll following the completion of Big 12 regular season conference play shall be the representative THIS WOULD MEAN OU, RIGHT?
6. The team with the best overall winning percentage [excluding exempted games] shall be the representative
7. The representative will be chosen by draw.