No one knows exactly how slots odds are worked out; they are kept secret by the casinos. However we do have a general knowledge of how results are calculated. This page takes a quick look at the process.
Slot Machines and the Random Number Generator
You may have heard of the Random Number Generator or RNG. Modern slot machines use it. The Random Number Generator is built into a slot machine to perpetually generate numbers for the machine even when it is not in play. It does so at a blinding speed of thousands of numbers per second. Each number corresponds to a symbol on one of the reels. Several numbers may correspond to the same symbol, thus making some symbols more likely to appear than others. Now when you press (or click) the button for a spin, it picks the numbers generated by the RNG at that precise moment. When the reels stop spinning, the symbols corresponding to these numbers are displayed on-screen and you are paid if it is a winning spin.
What this means is the symbols that appear are chosen even before the reels spin! The spin is actually just a show for the player. The reels will stop at exactly those symbols that were picked from the Random Number Generator when the button was pressed!
So now that you understand that, stop crossing your fingers and praying when the reels spin. It's only an illusion! :)
Symbols Weighting
Each slot machine has several symbols in it, as you know. For example: bar 1, bar 2, bar 3, blank spaces, and red, white and blue number symbols. Now there are a certain number of "stop numbers" in each slot machine, say 60 plus the reels, say 3. Each number on each reel represents a symbol. A symbol may be represented repeatedly. The lowest paying symbols have the most numbers standing for them. The highest paying symbols have the fewest numbers so they appear very rarely. Think about it: If there are 4 numbers for a red 7 and only 1 number for a white 7 on one reel, is not the 7 more likely to appear? That's how symbols are weighted and why jackpots are hard to hit.
A partial table of numbers may look like this:
Stop Number Reel 1 Reel 2 Reel 3 1 blank red 7 bar 2 2 blank red 7 blue 7 3 white 7 bar 1 blank 4 white 7 bar 1 blank 5 bar 3 bar 1 blank
So if the stop numbers are 5 for reel 1, 3 for reel 2 and 2 for reel 3, the result will be: bar 3 - bar 1 - blue 7.
A symbol like red 7 may have more numbers standing for it in one reel than in another. That is, red 7 may have 1 number for it in reel 1, 5 in reel 2 and 4 in reel 3.
Slots Payoffs
Because the numbers are chosen from the RNG, and the choice is made at the EXACT moment the player makes the spin, no one can predict a jackpot hit. Further, it is not true that a slot machine is ever "due." It can hit the jackpot anytime. Even the payback percentage is never "due." It's just that the longer the slot machine is played, the closer it gets to its required payback percentage. A slot machine does not "know" when it is "due" and it will not consciously choose to be "hot" or "cold," "tight" or "loose."
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