explain to me about these random number generator thingies


Dormant account
Dec 29, 2005
Just outside Seattle Washington
I've been curious about the "random number generators" since I started playing about a year ago. Since, after a few unpleasant experiences with casinos using other software I limit myself to microgaming establishments so my inquiries pertain to that programing. Are the generators at MG casinos strung together in someway or does each casino(or casino group) have its' own random number generator? I have had a number of very strange coincidental wins. Once over a two night period of time I had bonus rounds on "Thunderstruck" at 2 unrelated(except by software brand) casinos that both paid $3,450.00. and during the same week hit jackpots on "Tomb Raider" at 2 additionnal unrelated clubs(the game hasn't given me the time of day since). There was another period of about 3 weeks when "Reel Thunder" was hotter than a pistol no matter where I played it. I would go in with 300 bucks and just play until I was 200 dollars ahead, skim that amount off into a withdrawal, go back to the game until I was another $200 up and repeat the process again and again, when "Reel Thunder" went cold "Sunquest" took off. For 3 weeks or a month about 6 months ago "Triple Magic" was spitting out money like crazy. Right now Pollenation is treating me consistently very well. That is not to say that I am ahead of the game by any means, in between the streaks I go through whole months where I bomb out on everything and every casino. Am I over analyzing and making myself crazy or has anyone else noticed/experienced these freaky all or nothing streaks? Any explanations or opinions would be greatly appreciated.:what:
Here is what i found:

Ask The Slot Expert (Random Number Generator in a Slot Machine)
By John Robison
24 October 2002

Dear John,

Have read your article and several others regarding the random number generator. Did I understand correctly, are the random numbers truly random?

Thank you for your attention,

Dear Mitch,

The numbers produced by the Random Number Generator in a slot machine are not truly random because they are the result of a mathematical process. If you knew the formula used and the value of the last random number generated, you would be able to calculate the next random number that would be generated.

The Random Number Generator is more correctly called a Pseudo-Random Number Generator. The numbers appear to be random, have many of the properties of random numbers and satisfy many of the tests for randomness, but are not in fact generated by a random process.

Best of luck in and out of the casinos,

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Ask The Slot Expert(Random Number Generator (RNG) in a Slot Machine)
By John Robison
25 December 2002


We have a local floating casino with mostly the old-style slot machines that have the 3 spinning wheels, so you can peek inside the machine and see some of the internals.

I noticed there are 3 "odometers" inside, upper right side. Do you know what these are tracking?

Is it possible to correlate a machine that might be ready to payoff with particular readings?

Thanks, Dale

Dear Dale,

The meters you see are used for accounting purposes. They might be counting the number of coins played in the machine, the numbers of coins paid out, the number of plays on the machine, etc. The meters count different things on different machines. Sometimes there's a label on the meter or the window to let you know what the meter is tracking.

There's no way to find a machine ready to pay off by looking at the meters. Each result on a slot machine is determined by the Random Number Generator (RNG) and the RNG doesn't care--or even know--how much the machine has paid out. The odds of hitting any particular winning combination are the same on each and every spin.

Best of luck in and out of the casinos,

Source: Link Removed (invalid URL)

Understanding the Random Number Generator (RNG)
From Bill Burton,

The RNG Program
The Random Number Generator (RNG) is the brains of the slot machine. While most player know that there is a computer chip picking the numbers, they do not fully understand how it works and this can lead to some of the many myths and misconceptions about a slot machine. One of the most common myths is that a machine has a cycle that can let a player know when it is due to hit. Many Snake Oil Salesmen will try to sell you a system for doing just that. Save your money it cant be done.
Inside the slot machine is a microprocessor similar to the one in your home computer. Instead of running Word or Excel, it runs a special program, the RNG, that generates numbers to correspond to the symbols on the reel of the slot machine.

You might say that the RNG is in perpetual motion. As long as there is power to the machine it is constantly selecting random numbers every millisecond. The RNG generates a value between 0 and 4 billion (approx number) which is then translated into s specific set of numbers to correspond to the symbols on the reels. The outcome of each spin is determined by the number selected by the RNG. This number is chosen when you hit the spin button or deposit a coin.

The RNG uses a formula known as an algorithm which is a series of instructions for generating the numbers. The scope of this is beyond most of our mathematical knowledge but can be checked for accuracy. This is done by the Casino Control Board and other testing laboratories to make sure that the program performs as it should so the player will not be cheated.

While all of this may sound reasonable it still does not give the layman a basic understanding about how the RNG works. I would like to try to explain it in a simplified manner that I think most of us can relate to. Although this is not precisely how the RNG operates it should give you a basic understanding of the principles of how the winning spins are determined.

Reel type slot machines have a number of spaces on each reel that contain a symbol or blank. These are refereed to as the physical stops. Most of the old mechanical machines had reels that could hold 20 symbols while the modern slots have reels with 22 physical stops. The micro processing technology allows the new machines to be able to accommodate a large number of Virtual stops which I will explain in a future article.

For this example, lets simplify things and imagine that there are only 10 stops on each reel. With 10 stops there can be 1,000 different combinations. We get this number by multiplying the number of symbols on each reel. (10 x 10 x 10 = 1,000) The 1,000 combinations that can be attained are known as a cycle and this is the word that sometimes confuses a player into thinking that the machine has cycles of winning and losing.

The odds of a three number combination being picked are one in a thousand. Theoretically if you play 1,000 spins you should see each of these number combinations once. However we all know that this is not the case. If you played a million spins you would see that the numbers would even out to be closer to the actual probability. This is similar to flipping a coin 100 times. Although the odds are 50 -50 you are unlikely to see 50 heads and 50 tails after 100 spins.

Many of you have seen the Daily pick 3 lottery drawing. They have three glass bowls or drums each containing ten balls numbered 0 -9. The balls are mixed up and when the top is lifted a ball pops up the tube showing you the first number. This is repeated for the second and third number to give you a three digit winning combination.

A Simple Example
To use this as an example of the operation of the slot machine, we will replace the numbers 0 -9 on the balls with slot symbols. In each bowl, we will have one ball with the jackpot symbol on it. Two balls with a Bar, three balls with a cherry and four balls which are blank. Imagine the RNG in the slot machine as the person drawing the winning combination.
Here is the breakdown of the number of times out of a thousand that the winning combination made.

3 Jackpot 1 (1x1x1)
3 Bars 8 (2x2x2)
3 Cherries 27 (3x3x3)
Total Wins 37

There are 963 losing combinations consists of:
3 blanks
2 blanks and a symbol.
1 blank and two different symbols.
3 mixed symbols.

The RNG picks these combinations of numbers thousands of times each second.
Now imagine a sting of blinking lights where only one bulb can be lit at a time. The electrical current is zipping from bulb to bulb down the string. When you push a button the current stops moving and the bulb in that position lights up. In this example the light represents the three digit number just picked by the RNG. If you hesitated a second before pushing the button the results would be different. This is the same as you getting up from a machine and seeing someone else sit down and hit the jackpot. The chances are astronomical that you would have hit the spin button at the exact same millisecond.
I hope this simple example has given you a basic understanding of the RNG and how it operates to determine the outcome when you play.

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