What conditions does your "smart random" algorithm use?
EDIT: Also, does this randomizer include the promo cards?
I'll answer your promo question first: not yet. For the beta we wanted to get the functionality out there and start getting feedback before entering the next round of feature development.
As for your first question, I'm going to copy/paste a little from our "About" section, because what my partner wrote sounds way better than what I could write to answer your question:
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We've played a lot of Dominion, and we noticed something about completely randomly generated sets: much of the time, they're a lot of fun. But sometimes, perhaps too often, you get a set of 10 kingdom cards that just doesn't work as well. Maybe there aren't enough +actions so you can't really use the cards out there. Maybe there are too many attacks, or so many +actions that the game really drags to a halt. Maybe there are plenty of funky, unique cards but not enough cards that actually help you get the treasure you need to win the game.
Enter the Dominion Smart Randomizer. Our randomizer doesn't just pick 10 random cards for you. We developed a special algorithm to generate sets of cards that will always be fun to play. No more "dead" sets of cards where you'll just end up buying the basic treasures. No more insanely long games due to far too many attack cards slowing everything down. Our smart randomizer aims to give you sets of cards that still draw from all the expansions and give you wildly varying sets, but in the end will be more balanced for fun, exciting gameplay. We aim to give you Dominion at its best. And if you feel like going completely random anyways, you can always select the "true random" option below.
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Thanks for taking a look and responding!
Derek