User blog comment:PYR0NY3H/Summoning Tips!/@comment-25500470-20150221025546

I frankly don't buy the "pure RNG" scenario. I don't buy it.

As a software developer myself, I'm 99% confident that Nubee is using a "salt" technique. In simple terms, skewing what would otherwise be pure randomness by adding a positive or negative attribute to the pool.

Example:

Say I wrote a RNG program that is designed to select a number from 1 - 100. I say that in order to win the grand prize, you must hit an odd number. Well, you know your odds should be 50%, right? Same as with an even number. Prime number? 1/4ths chance. In most cases, a low value item I might set the probability to be an odd number. Higher value? prime number. Higher value? Number divisible by 10 (1/10th chance). Highest value? A specific number, say, 47. In a card game, I might assign these highest value cards one of the numbers between 1 and the maximum number of total cards. So if I have 500 cards and 100 of them are max value, I should have 1/5th chance of pulling that highest value.

A "salt" means that, instead of doing something like that, and I admit it's overly simplistic, I would purposely remove cards from the pool, or set their number to one that can never be pulled (like zero), even if I show them as eligible. So for a given event, I might only ever allow 10 highest value cards to be eligible in the pool. well, now my chances are 10/500, or 1/50. I believe this technique is what is truly random, per player: which UR cards are in the pool and able to be summoned will differ unless it's a guaranteed card.

No proof, all I can tell you is that when Flip Summon first launched, it was dropping URs like mad. I'd say a third of the URs I have now came from that one run. Ever since then, it's stingy as all get-out. I MIGHT get one non-guaranteed UR if I run 3-4 times.

The Awakening Special Summon was another one that was dropping URs like mad. Basic Special Summon, nothing, despite numerous pulls.

The old Select Summon - where you pick one of two cards - used to drop URs. We have never seen that summon type again.

Ultimate Summon - since they launched the feed, I MIGHT see one person a day get a UR if that. Everything else is an SR card. Given it has mostly the same lineup as the Premium, at least according to the screen, how do you explain that?

The only answer that makes sense is the salt technique. I don't think the full pool of URs is in Ultimate OR Premium. I think they rotate, and each person really only has a much smaller pool of URs that can be summoned, regardless of the probabilities.