Iowa - needs to win one of last 2 games against ILL or. @Neb. Or if Iowa loses twice, then Iowa needs Neb to lose to Wisc, ILL to lose to NW and Minn to lose once
Neb- Neb needs to win @Wisc and Neb needs to win against Iowa, and Neb needs Iowa to lose against ILL, and Neb needs Minn to lose once.
ILL - ILL needs to win @ Iowa and ILL needs to win against NW, and ILL needs Iowa to lose @Neb and ILL needs Neb to lose @Wisc
Wisc - To tie for first, Wisc needs to beat Neb and then Wisc needs to beat Minn, and Wisc needs Iowa to lose against ILL, and Wisc needs Iowa to lose @Neb. In addition if ILL beats NW, then there would be a 3-way tie between Iowa, Wisc and ILL and I don't know who wins that 3-way tie.
Minn - Minn needs to win @OSU and Minn needs to beat Wisc. Minn also needs Iowa to lose twice. Minn also needs ILL to lose to NW and Minn needs NW to lose to Purdue.
NW - to tie for first, NW needs to beat Purdue and NW needs to beat ILL. NW also needs Iowa to lose twice. In addition if Minn wins twice, there would be a 3-way tie between Iowa, NW, Minn and I don't know who would win that 3-way tie.
OK I am done (I think)