This is what was done at my school.
1. At my school if a sorority does not extend you an invitation for a Preference Party they may NOT offer you a bid at all...initially, snap, or COB.
2. If a PNM is NOT listed on your "B" list for bid matching you may not snap bid or COB her. If she IS on your "B" list and you have met quota for rush you can COB off of your "B" list until total is reached.
3. If there is Sorority A, B, & C and a PNM only puts and A & B on her preference card then she cannot be offered or accept a bid from Sorority C.
Is it like this everywhere else?
Have a great day