I put up a pretty comprehensive summary here from the Northwestern perspective (which covers the UW and Iowa perspective quite well).
https://northwestern.forums.rivals....hinations-and-tie-breakers.40914/#post-564692
Bottom line for Iowa:
1) Beat Purdue this weekend or it’s all over.
2) Hope Wisconsin gets beat by Penn State and/or Purdue.
3) Beat Northwestern.
4) Win the rest including a pesky/improving Nebraska team.
If you win out (and beat Northwestern) and Northwestern beats Illinois and Minnesota and Wisconsin also wins out, you need to win the 3-way (7-2) tie breaker that gives me a headache.
NU>UW
UW>Iowa
Iowa>NU (if you beat the nerds)
The 3-way tie breaker in this scenario gets really complicated. NU’s win over Michigan Sate looms large. However, Iowa’s win over Maryland could be huge.
NU and UW lost to UM. Iowa lost to PSU. Nobody in the west plays OSU except Purdue. You need to beat Purdue anyway (sending them to 6-3)... In any regard, root for Maryland, Penn State, and Indiana (teams you played) and root against Michigan, Michigan State and Rutgers. (Ohio State matters not.)
The nerds at Northwestern are watching your game against Purdue closely. If you lose that game, Northwestern can lose to you guys in two weeks and will still go to Indy if they beat Minny and Illinois... Break a leg!