Cut lines for the B1G Tournament:
The top-4 do not have to play until Friday, March 13. As of right now Purdue, Nebraska, and Michigan State are in a three-way tie for 3rd, 4th, and 5th place so the loser of that tie would have to play on Thursday. Additionally, Illinois is only 1/2 game ahead of them and Wisconsin is only a game behind them so all of those teams are in the mix.
The #5 though #8 seeds do not have to play until Thursday, March 12. As of right now Ohio State and Iowa are tied for 8th/9th so tonight's game between them in Iowa City (the only meeting of the Hawkeyes and Buckeyes this season) will probably decide it with the winner getting to rest until Thursday and the loser playing Wednesday.
The #9 through #14 seeds do not have to play until Wednesday, March 11. As of right now Maryland leads Rutgers and Northwestern by 1/2 game for the #14 seed. Maryland is 1-1/2 games behind #13 Minnesota and Washington so the Gophers and Huskies are probably safe. Rutgers and Northwestern, however, are only 1/2 game ahead of Oregon so all of the Terps, Gophers, Knights, Wildcats, and Ducks are in the mix here.
Penn State is 2.5 games out of 14th place so they are all but mathematically locked into playing on Tuesday.
Mathematically Michigan has clinched a top-4 seed because they can do no worse than a 4-way tie with Illinois, Nebraska, and the PU/MSU winner.