Here are the tiebreakers as of 5 PM Saturday:
In a tie with just 1 team:
RU WINS the tiebreaker in a tie with just 1 team with NW, Washington ... and Nebraska (RU is 1 game behind Nebraska) should they end up tied.
RU LOSES the tiebreaker in a tie with just 1 team with PSU (RU is 1-1, but PSU beat Purdue, a team currently higher in the Big 10 standings than RU beating UCLA ... that could change if UCLA wins at Purdue, finishes tied or ahead of Purdue - UCLA is currently 10-6 vs Purdue 11-5 ... UCLA is likely favored in the 3 games left other than Purdue), Iowa (bummer of a loss), Indiana and Ohio St (RU is 1 game behind OSU and a half a game behind Indiana).
TBD: RU tiebreaker if in a tie with just 1 team: USC and Minnesota - 2 RU home games, still ot be played.
In a tie with 3 or more teams:
I suppose if RU can just win its home games, to go 8-12, then the odds are Washington, PSU, NW all have at least 12 losses each - probably more ... And if RU ties with all 3 with 12 losses (or even 13), RU wins the tiebreaker (by the virtue of a 3-1 record in that mini-pool of RU, Washington, PSU and NW ... PSU is 2-2 in that pool with no more games; Washington is 2-1 in that pool, no more games; NW is 0-3 in the pool, with no more games), and finishes 15th - in the Big 10 tourney by the skin of their noses, so to speak.
Things get a lot more complicated if RU ties in a pool with 11 or 12 losses with 3 or more teams that include teams they lost to (like Iowa, Indiana and OSU) ... or with teams they beat (like Nebraska, NW and/or Washington) ... and of course, teams they have yet to play, like USC and Minnesota - wins or losses in those games will make a huge difference.
I mean, jeez ... you COULD see a jam with RU, Minnesota, USC, Iowa, and even Nebraska and Indiana or OSU with 11 or 12 losses each. It would NOT be far-fetched to see RU, Minnesota, USC, Iowa and Indiana ALL with 12 losses in conference ... Nebraska seems less likely (easier remaining schedule, would have to lose 3 of 4 - with 3 at home, including Iowa and Minnesota at home). The current combinations seem limitless.
