I don't know in this particular case, but I think the thinking is that girls are ok with getting second of two choices but tend to be unhappy when they get third of three. With RFM being what it is, you don't NEED a third option to guarantee your match, so it's ok. It just means they get cut harder earlier.
That makes sense. They've been doing this at Wash U in St. Louis for awhile and it seems to work well.
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