I've been denied a price match by Hilton because the cheaper rate from Hotels.com required me to "log in" to my account on Hotels.com.

"Price must be without restrictions, meaning it is viewable and bookable by anyone.......or are not available to the general public (like member rates, negotiated rates and team member rates), or require a login, credit card number or a code to see"

What a joke of a price guarantee. Anyone can set up a Hotels.com membership in a minute, and they don't allow that for price comparison purposes!