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didn’t read the linked thread but UChicago stacks need with merit. G
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While UChicago doesn’t use CSS, they have their own institutional formula and will give as they see fit.
Your DD was a very desirable applicant, perfect ACT, NMF, and a URM. Likely UChicago wanted to insure that she picked them rather than another top school. That is a strategy that many tippy top schools do to poach from each other.