The third score can be a ranking, as in all the desserts you sampled from best to worst, 1 being the best (I've also been told to rank my best from 1-9 with 9 being the best), OR what I've been asked to do lately is to grade the dessert on how it would compare to what I think the ultimate in that category would be, as in "is this the best peach cobbler you've ever had?" or "is this the best cheesecake you've ever had?" - and "How does this compare to that?" That third score really depends upon what the organizer asks it be; I've had some contests where the dessert category was supposed to be something with a particular fruit, and for that score, we were supposed to grade each entry on how well that entry filled that requirement - as in, was it a good & tasty way to represent a taste of that fruit. And then there are some organizers that don't really care HOW the scoring is done and just want to be able to announce a "best dessert"! Remember, dessert is an ancillary (extra) category and not a requirement.
Lynn H.