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In 1984 Inge Telnaes received a patent for a tool titled, "Electronic Gaming Device Utilizing a Random Number Generator for choosing the Reel Stop Positions." International Gaming Technology IGT bought the Telnaes patent and now all slot manufacturers using what has become referred to as Talneas mapping or reel mapping must license the patent from IGT. This device allowed for the creation of what we call the virtual reel.
While a physical reel could have 22 symbols of stops on it a virtual reel may have 32 as much as 256 and even virtual stops. The virtual stops are assigned to 1 of the symbols at the physical reel. Listed here are the potential outcomes for various numbers of virtual stops.
Stops Outcomes
32 32,768
63 262,144
256 16,777,216
512 134,217,218
Since you don’t know the choice of virtual stops a machine has it's impossible to figure out what the percentages are for hitting the jackpot. The choice of each symbol at the reel too can affect the return.
Look at this situation for a machine that has 32 stops on each reel. The overall combinations are 32,768. Listed below is the payouts and collection of occurances out of 32,768
Pay table is:
Symbol Pays Occurrences $Payout
3 Sevens 250 30 7,500
3 Bars 75 80 6,000
3 Cherries 12 12 144
Any 2 cherries 8 476 3,808
Any Cherry 2 6180 12,360
Total wins $29,812
Total bets $32,768
Return 90.979%
Here are the symbols on each reel.
Symbols Reel 1 Reel 2 Reel 3
3 Sevens 5 2 3
3 Bars 5 4 4
Cherries 2 3 2
Blanks 20 20 23
Now for those who were to modify the collection of bars on reel 3 from 4 to 5 the return would increase to 95.577%.
If you decrease the number to two the payback could be reduced to 81.824%
If you changed the cherries at the first reel from 2 to a few the payback would increase to 99.072
This example shows you ways adjusting the symbols can affect the return of the machine.
Read More... [Source: About.com Casino Gambling: What's Hot Now]

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