I noticed the below quote from 'Rusty' in a thread about 'Allstar Slots'
I used my own personal method to map the reel layouts and became apparent that the reels are changed dynamically.
For example a bonus symbol may be added or removed for certain periods.
(Frog on Happily ever after for instance)
Well this not so different to RTG and Rival but still a bit disappointing that variance and RTP is not left alone during play.
I used to work with a guy who had previously worked for a land based pokie machine (slot) company. I whinged to him one day about hitting the feature after I had only a few cents left. He informed me that the reels were fixed based on the bet amount. So if I changed my bet it would also effect the reels, therefore I would not have got the feature if I had been betting my previous amount.
Anyway I was wondering if anybody out there in Casinomeister land, knew how different online casino's generate there variance. Based on Rusty's assessment above it sounds like some software do this dynamically (which doesn't sound good to me), as it means you can be betting with an extremely low likelihood of winning when the dynamic adjustment is for the negative.
It would be great if any Casinos reps responded to this.
Hi baabaa.
Since you quoted me I will reply to your question.
First of all the majority of software operators would contend that the variance and/or return of their slots are altered.
I obviously believe otherwise and you will find several threads that examine the weight of evidence (pun intended) with arguments from myself and those that are either affiliates or represent the software in some way.
For example in the RTG threads you will see discussions between Dogboy (representing RTG) and myself but there are similar discussions on Rival and MGS.
There is some good information in there for slots players.
So how to answer your question?
Assuming that a video slot is not weighted and completely fair then variance is basically your bet/return ratio.
By necessity it is a very exact science in slot design because you need to have a balance between a slot being fun to play (plenty of wins) but still being meaningful (you can win something worthwhile).
The lowest variance possible would be to get 95% of your bet back every spin (95% return slot)
The highest possible variance would be to have just One winning combination out of the total combinations possible which would pay 95% of the total wager when it hits. (95% return slot)
Of course neither of those are viable slot designs so designers look for something in between (the sweet spot that keeps us playing) and add bonus rounds to increase the excitement.
Of course these bonus rounds need to be incorporated into the overall variance but have their own variance (how often they hit - how many times bet are they likely to pay - how wide is the range) so things can get quite complicated.
That is where it gets interesting and why bonus rounds are predetermined and yes free spin rounds too though again some still dispute this.
The logical question is though- why have predetermined bonus rounds and yet have no control over random free spin rounds with large multipliers?
It is a no brainer.
Mostly the prize you win is dictated by an algorithm or probability table but basically a range is set according to previous results but it will generally retain a random element. Think of it like rev limiter on a car.
In the example in which you quote me I give a specific example of dynamic weighting but as far as I know no software supplier as far as I am aware has admitted to adding/removing symbols in real time.
Only RTG say that they have different versions of the same slot which have slightly different reel layouts that alter the theoretical return.
From my extensive play I have to say my sincere belief is these changes appear real time.
I have witnessed the same thing in land based casino slots and as far as I know it is not against UKGC regulations providing the slot retains the stated overall return percentage over a set number of spins.
I think it is bad practice because even though the slot states 93% you may well be playing it when it is at 65% for example because the slot is designed to take X in before paying Y out or to take x in after paying Y out.
They are just like sophisticated versions of the old UK AWP slots only they retain a random element.
The problem is worse in remote casinos because this type of weighting can be so easily manipulated and more volatile.
That is why I would like to see software designers think outside the box when designing bonus slots and remove any weighting in favour of design that relies solely on mathematics and probability for control and variance. That may need to be a fairly low variance slot but so be it.
No doubt there will be people who disagree with some of that but I hope that gives you some insight into how variance works and how you can alter variance while retaining the same theoretical return percentage.