JP2003175157A - Minutely branching reel type slot machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for operating a slot machine by increasing the amount of a prize while maintaining a game profit by storing a combination of reel stop positions in the form of a tree and using a random number generation function in the slot machine (10) offering a prize in accordance with a combination of signs when a coin is thrown in, a handle (12) is pulled and a plurality of reels (16, 18 and 20) rotate and then they stop. <P>SOLUTION: Combinations of possible reel stop position signs are assigned to terminal nodes of a lookup table stored in a ROM (34) in the form of a tree. In the tree, there are one main hierarchy, a plurality of subsidiary hierarchies and a plurality of terminal nodes. In each hierarchy, there are many entries leading to the subsidiary hierarchies and terminal nodes. When a game is started, an entry on each hierarchy is randomly selected until a terminal node is selected, by using the ransom number generator of a microprocessor (26). Subsequently, a combination of signs assigned to the terminal node selected is displayed on a payment line (30 and 32) and a prize is paid on the basis of a prize table (28). <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a game machine, and more particularly, to an electronic reel type slot machine having a plurality of reels (design / symbol wheel or board) rotatable about a common axis. Regarding In a typical reel type slot machine, a payout or a prize is paid when a winning symbol or a set of symbols is displayed on the pay line of the machine. To start the game, press the button,
Or pull the handle to start spinning the reel.

[0002]

2. Description of the Related Art In one type of design, after the reels have stopped, their angular positions are detected, and an appropriate prize amount is
If so, calculate it and pay the player. Another approach on modern machines uses a random number generator to select the symbols to be displayed on this pay line. Therefore, the prize amount is determined based on the prize table in which the prize amounts corresponding to various combinations of the winning symbols are described. The prize amount given by either method is limited because the probability of obtaining the maximum prize is the reciprocal of the number of reel stop positions per reel to the power of the number of reels, which has a fixed limit.

Therefore, the manufacturer of the reel type slot machine can maintain an appropriate game profit for the manager,
It is desirable to provide a new method of increasing the prize amount of a reel type slot machine. The higher the prize amount, the more interest the player has in the game, which leads to maximization of game revenue.

In prior art electronic slot machine designs, one way to increase prize money is to use "virtual reels." According to this method, a plurality of numbers are assigned to most physical reel stop positions, and at least one number is assigned to all physical reel stop positions. In this way, the chances of winning big prizes can be reduced by assigning these stop position combinations to a smaller number.

[0005]

SUMMARY OF THE INVENTION The present invention provides an alternative method of increasing the prize level and operating a slot machine in an electronic reel slot machine. The betting rate for a particular winning symbol set can be "corrected" by assigning each possible reel stop position combination to a unique terminal node (position) of the random subdivision tree diagram stored in memory. The dendrogram has one main hierarchy, multiple sub-hierarchies, and multiple terminal nodes. Each layer has a number of entries following the lower layer or terminal node.

When playing a game, the microprocessor of this gaming machine randomly selects one of the entries on this main hierarchy. If this randomly selected entry leads to a lower hierarchy, one of the entries on that hierarchy is randomly selected. This selection procedure continues until each terminal node in the next hierarchy is selected. One reel stop position combination is assigned to each terminal node. Therefore, the reel is controlled to display the combination assigned to the selected end node on the pay line. if,
If the displayed combination matches one winning symbol combination in the published prize table, the coin mechanism is activated and the player is paid the prize.

In an alternative embodiment of the invention, one sub-branch dendrogram is utilized for each reel strip,
Each dendrogram has one main hierarchy, multiple sub-hierarchies, and multiple terminal nodes. All symbols for each reel are
It is assigned to the corresponding end node of the corresponding subdivision tree. To display the reel stop position combinations on the pay line of this slot machine, the terminal node and its assigned symbol are randomly selected for each reel using the selection procedure described above. The selected combination is displayed, and if it matches one winning symbol combination in the published prize table, the player is paid a prize.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, an electronic reel type slot machine 10 is shown. The slot machine 10 has
There is a handle 12, a coin slot 14, a prize tray 22, and reels each having a plurality of stop positions. Each reel has a system of symbols used to display the results of the game played on the slot machine 10. In the illustrated embodiment, the slot machine 10 includes three slot reels 1.
There are 6, 18 and 20, each of which has 18 stop positions, each of which corresponds to a symbol. These symbols form a combination that corresponds to the prize table displayed to this player.

It should be noted that the slot machine 10 can incorporate any number of reels, and that these reels can have any number of stop positions if appropriate. Since it may be "blank" corresponding to each stop position of each reel,
You can use any symbol system with just one symbol.
When the coin is inserted, the button and / or the handle for starting the game are activated. By pushing this start button or pulling the handle,
The player selects a set of winning symbols and, if displayed on payline 24, causes the microprocessor control system to spin these reels with the intent to win a prize.

FIG. 2 shows an example of three reel "strips" that can be tried on reels 16-20. Each reel strip has a system of symbols as discussed above, in this example there are 18 separate physical stop positions where one symbol is displayed. It should be noted that duplicate symbols can be used on each reel. In the illustrated example, the first reel displays two "7" s, two triple bars (horizontal bars), four double bars, three single bars, and seven blanks, The second reel has three "7", two triple bars, two double bars,
Shows 4 single bars and 7 blanks, the third reel has two "7", three triple bars, two double bars, four single bars and blanks. Is displayed.

FIG. 3 is a block diagram of a control system suitable for implementing the present invention. When a coin is inserted into the coin slot 14, the coin detector 24 ′ sends a signal to the microprocessor 26. The microprocessor then randomly selects a set of symbols to display on the payline. If the player wins, the microprocessor 26 sends a signal through the coin prize tray 22 to the ordinary coin mechanism 28 to dispense the prize to this player.

The reel motor and stop controller 30 responds to a signal from the microprocessor 26 by the reel 16
Rotate -20. This signal is generated after the coin is inserted and the player operates the handle 12 or the start button. The controller 30 has these reels on the pay line 2
Stop these reels in a position determined by this microprocessor so that three symbols are displayed on the four.

During rotation of the reel, the microprocessor 2
6 randomly selects one of the reel stop combinations to display on this pay line. In order to ensure that this selected reel stop combination is displayed, the detector 3
2 provides a feedback signal to the microprocessor 26 representing the rotational position of each reel with respect to the payline 24. This type of feedback is utilized according to techniques well known in the art.

FIG. 4 illustrates a winning symbol set A-F and a losing symbol set G that can be displayed on the pay line 24 with the reel strip of FIG.
The following is a symbol table listing. The desired winning percentages corresponding to the number of combinations of physical reel stop positions and the symbol sets AF are also shown in FIG. The betting rate for a particular set of symbols can be controlled by assigning each possible reel stop position combination to the terminal node that yields the only result of the random bifurcation tree. The position in the dendrogram influences the degree to which this symbol combination is chosen. For example, the desired bet rate described in FIG. 4 is fulfilled by the subtree tree diagram 38 of FIG.

The branch tree diagram 38 has a plurality of hierarchies 40-54 having level values of 0.10 to 0.00001 and a plurality of entries connected to lower hierarchies or terminal nodes.
This dendrogram is a conceptual diagram used to explain the method of the present invention. In practice, each reel stop position combination corresponds to its end node position in the tree diagram 38,
It is stored in a look-up table in the ROM memory. Each of these possible reel stop position combinations is assigned to this tree structure only once and thus to only one storage location in ROM 34.

The betting rate for each of the symbol sets AG shown in FIG. 4 can be calculated from this dendrogram as follows. For each hierarchy in the dendrogram 38, the number of terminal nodes associated with a particular symbol set is multiplied by the level value for that hierarchy. Then, these numbers are summed to calculate this bet rate.

For example, the desired bet rate for obtaining the triple B symbol set B is 0.00180. Referring to FIG. 5, there is one "B" in tier 46, and tiers 50 and 52
There are eight "B" s. So the desired bet rate to get three triple bars is (1 * 0.001) + (7 * 0.000
1) + (1 * 0.0001) = 0.018.

The third term of this calculation requires explanation. It pertains to the lower hierarchy 51 down from the hierarchy 50. Figure 4
Note that requires 12 unique ways to display three triple bars. In order to include all of these combinations and obtain a desired bet rate on it, it is necessary to lower one of the Bs to a lower hierarchy in which all nodes are the B groups. The number of remaining nodes in this lower tier is equal to the number of combinations that were not used in setting this bet rate. Therefore, the lower layer 51 has four B nodes.

If an entry connected to this lower hierarchy 51 is selected, the probability of obtaining a combination of B is 1.0, but the only question is which combination of B's. The microprocessor 26 randomly selects one of the nodes of this lower hierarchy to determine which reel stop position combination to display on the pay line. Using a similar technique,
Implement the probabilities for each of the other symbol groups A and CG.

It should be noted that the implementation of the FIG. 5 embodiment is accomplished primarily using the decimal hierarchy. That is, there are only 10 entries per tier. Using a variable size sub-tier, where each sub-tier has a probability of 1 for the assigned set of symbols, allows all possible combinations of reel stop positions to be used, so Combinations do not have to be used more than once or stored in memory. So, for example, three 7s to 12 without changing the bet rate
In order to display in a unique manner of three levels, a lower layer 159 having three end nodes is provided, one for each additional reel stop position combination for displaying three 7.
It is prepared instead of one "A" combination of 4.

It should be noted that the desired bet rate can be achieved without using lower tiers. However, in that case, not all possible combinations of symbol sets are displayed. Since it is desirable to display each possible combination of symbol sets,
It is preferable to use the lower hierarchy.

Referring to FIG. 6, there is shown a computer flow diagram illustrating the steps performed by microprocessor 26 to select the combination of reel stop positions to be displayed on the payline. The steps shown in FIG.
It is stored in the OM 34 as a computer program and is executed by the microprocessor 26 when playing this game. The latest game data is stored in the RAM 36.
FIG. 6 is a flow diagram illustrating the essential program steps of the present invention, which can be executed on any desired type of computer system.

The program begins at start step 58. The random number generator function of the microprocessor 26 is used to randomly select one of the entries on the main hierarchy 40 of the branch tree (steps 60-64). With reference to the branch tree diagram of FIG.
Randomly select an integer between (or 0-9),
It is used to select one of the ten entries in this main hierarchy 40. If the selected entry is not the terminal node (step 66), the program descends to the next lower level (step 68) and repeats steps 60-64 until the terminal node is selected.

If the selected entry is a terminal node,
The unique reel stop position combination assigned to it is displayed on the pay line and, if any, the appropriate prize is determined (step 70). The prize amount is stored in the look-up table of the ROM 34 for each of the winning symbol sets AF (FIG. 4). The reels that spin while this selection is being made (or, if desired, spin after selection) are stopped to display the selected stop position combination and the appropriate prize is paid (steps 72-76). .

FIG. 7 shows a second example of three reel "strips" mounted on reels 16-20. The winning symbol sets AF and the losing symbol set G, the corresponding winnings and the desired bet percentage that can be displayed on the pay line 24 are listed in the table shown in FIG.

FIG. 9 illustrates a second embodiment of a subtree tree diagram that implements the desired bet rates for the examples of FIGS. 7 and 8. For the sake of clarity, the number of entries in each layer connected to a terminal node or a lower layer is displayed in the form of 1 / X (1 in X). However, X is the number of entries in the layer. If the number of reel stop position combinations for a given symbol on a hierarchy is large, it is displayed directly in brackets below the hierarchy. These tiers have different X values as they are needed to implement each of the possible reel stop position combinations for a given symbol at the desired bet rate.

Using a variable length tier, especially for the lower tiers, minimizes the number of iterations of steps 60-66 (FIG. 6), allowing the wager rate to be accurately modified. A desired bet rate for obtaining a particular symbol set requires a minimum number of times down from this main tier to the next tier. For example, the desired bet rate to get three triple bars (Group B in FIG. 8) is step 6
It can be accomplished by repeating 0-66 three times. The desired bet rate (0.001818) is then issued by going from tier 78 through tier 80 to lower tier 88.

More specifically, if the random number generation function is layer 7
If you choose the corresponding entry of 8 (level 0.1),
Go down to level 80 (level 0.01). Repeating this random number generation cycle one more time will result in a further lower hierarchy 88. The lower level 88 has 22 terminal nodes, four of which represent four possible reel stop position combinations for displaying three triple bars. So
The lower layer 88 has a display of B (4). The betting rate for selecting one of the end nodes of this B group is 1/1
It is equal to 0 * 1/10 * 4/22 = 0.01818.

Similarly, the desired bet rate for obtaining three double bars (Group C) is issued by descending to tier 100 through tiers 78, 80 and 98. This desired wagering rate of 0.0018 is obtained by assigning one of the eight possible reel stop position combinations to tier 98 and the remaining seven combinations to lower tier 100.
So the desired bet rate is (1/10 * 1/10 * 1/1)
0) + (1/10 * 1/10 * 1/10 * 7/9) =
Equal to 0.001 + 0.000777 = 0.001777.

Calculations similar to those shown above can be used to implement the desired bet rates for the remaining symbol sets resulting in the tree structure of FIG. After all the betting rates for the winning symbol sets have been taken, the losing reel stop position combinations are "written in" to the remaining terminal nodes of this branch tree. So the desired bet percentage to get the losing symbol set (group G in FIG. 8) is
(1/10 * 7) + (1/10 * 1/10 * 5) + (1
/ 10 * 1/10 * 5/10) + (1/10 * 1/10)
* 18/22) + (1/10 * 1/10 * 75/77)
+ (1/10 * 1/10 * 3) + (1/10 * 1/10
* 3) + (1/10 * 1/10 * 1/10 * 6) + (1
/10*1/10*1/10*2/9)=0.8391
Is equal to 44.

FIG. 10 shows an alternative embodiment of the present invention, which is shown in FIG.
3 illustrates three exemplary reel "strips" mounted on reels 16-20 shown in FIG. Each of these reel strips has a symbol system, which in this example has five separate physical stop positions at which one of the symbols is displayed. These symbols for each reel are assigned to the unique terminal nodes of the subtree tree diagram corresponding to each reel. In the illustrated embodiment, each reel displays one triple bar, one double bar, one single bar and two blank symbols.

FIG. 11 is a table listing the winning symbol sets that can be displayed on pay line 24 (FIG. 1) for the strip of FIG. FIG. 11 also shows the number of physical reel stop position combinations and the winning percentages corresponding to the winning symbol sets.
The betting rate for a particular set of symbols is determined by assigning each symbol to the terminal node of the random bifurcation tree for each reel.
The position in this dendrogram determines the probability that the symbol will be selected.

The probability of choosing a combination of three symbols is calculated by multiplying the bet rate for each reel. As an example, the betting rate described in FIG. 11 is achieved by repeating the sub-branch tree diagram 150 shown in FIG. 12 three times. However, it will be appreciated that for the reels of the illustrated embodiment, only one dendrogram is needed because the symbol system of each reel is the same. If you use multiple symbol systems, you will have to use separate subtrees for each of the different symbol systems.

Referring to FIG. 12, a subdivision tree diagram 15
0 has a plurality of layers 152, 154, 156 and 15 each having an entry connected to a lower layer or a terminal node.
There is 8. As with the first embodiment, each of the possible symbols can only be assigned to this tree structure once, and thus to only one memory location in ROM 34 (FIG. 3).
It should be emphasized.

The probability of selecting each of the winning symbol sets, as described in FIG. 11, is to use this tree 150 three times (or three different symbol sets if different symbol sets are used): It can be calculated by repeating the dendrogram). For each hierarchy in the dendrogram 150, the number of terminal nodes associated with a particular symbol is divided by the number of terminal nodes in that hierarchy. If there are the same symbols at different levels of this dendrogram, repeat this calculation for each symbol and sum the results to arrive at the bet rate that selects that symbol for a particular reel. This procedure is repeated three times until one symbol is selected for each of the three reel strips shown in FIG. Finally, the numbers obtained in each iteration of the random number tree diagram 150 are multiplied to calculate the probability of obtaining a specific symbol combination.

For example, the bet rate for obtaining three triple bars is 0.
It is 000244. Referring to FIG. 12, one triple bar is placed in the hierarchy 158. Therefore, the bet rate to get a triple bar on one reel is 0.5 x 0.5 x 0.5 x
0.5 = 0.0625. Therefore, the bet rate to get a triple bar on each reel is (0.0625 x 0.0625 x
0.0625 = 0.000244). The bet rate to get a blank symbol on one reel is (0.5 x 0.5 x
0.5 × 0.5) + 0.5 = 0.5625. Therefore, the bet rate for winning three blank symbols is
(0.5625 × 0.5625 × 0.5625 = 0.1
77979).

FIG. 13 is a computer flow chart illustrating the operation of the alternative embodiment of the invention shown in FIGS. 10-12. Similar to the first embodiment, the random number generator function of the microprocessor 26 is used to randomly select the entry on the main hierarchy of the branch tree diagram corresponding to this first reel until the end node is reached ( Steps 160-174). The unique symbol associated with it is stored for display (step 176). For each reel of this slot machine,
Steps 160-174, using the same or different bifurcation dendrograms, depending on whether the reel strips are the same.
Is repeated (step 178). After selecting symbols for all reels, spin these reels, stop, display the combination on the payline, determine the appropriate prize, if any, and pay (steps 180-18).
6).

While the invention has been illustrated and described in detail in the accompanying drawings and foregoing description, it should be considered that it is illustrative in nature and not restrictive. So, for example, with a large reel strip, it can be adapted by simply expanding this dendrite structure.

[Brief description of drawings]

FIG. 1 illustrates a typical electronic reel slot machine in which the present invention may be incorporated.

FIG. 2 shows an example of a three reel “strip” with a symbol placed in a stop position.

FIG. 3 is a block diagram of a control system for the present invention.

FIG. 4 is a table showing desired bet rates for winning and winning symbol sets for the reel strip of FIG.

FIG. 5 shows a first embodiment of a subdivision hierarchical system of the present invention.

FIG. 6 is a computer flow diagram illustrating a preferred embodiment of the present invention.

FIG. 7 shows a first example of a three reel “strip” with a symbol placed in a stop position.

FIG. 8 is a table showing desired bet rates for winning and winning symbol sets for the reel strip of FIG. 7.

FIG. 9 shows a first embodiment of the subdivision hierarchy system of the present invention.

FIG. 10 is a three reel “strip” with a symbol placed in a stop position for an alternative embodiment of the present invention.
An example is shown.

11 is a table showing desired bet rates for winning and winning symbol sets for the reel strip of FIG.

FIG. 12 illustrates an alternative embodiment of the sub-branch hierarchy system of the present invention.

FIG. 13 is a computer flow diagram illustrating an alternative embodiment of the invention presented in FIGS. 10-12.

[Explanation of symbols]

10 slot machine 16, 18, 20 reels 24 payment lines 26 microprocessors 28 coin mechanism 30 reel motor and stop controller 34 ROM 38 Subdivision tree diagram

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Timothy J. Durham             Oak Parr, Illinois, United States             Ku, North Taylor 430

Claims (29)

[Claims] 1. A method of operating a multiple reel slot machine, wherein one of a plurality of symbol groups is displayed on a pay line, and a desired winning rate is fulfilled to operate the multiple reel slot machine. Storing the symbol specifications for the reels in the memory device by the microprocessor; (b) storing the desired prize rate allocation for each symbol group in the memory device; and (c) by the microprocessor. A look-up table arranged in a tree structure that includes all possible combinations of multiple reels into symbol groups and the microprocessor associates each symbol group with a different prize; , Each layer stores the end node that stores the combination of multiple reels, and the descent connected to the lower layer A step of preparing a look-up table having points with a microprocessor by a microprocessor, and (e) a combination of a plurality of reels corresponding to a desired winning rate at a terminal node position of a tree structure of the look-up table, Storing in a memory device by (f) randomly selecting numbers corresponding to terminal and descending nodes by a microprocessor; (g) resulting random, nearly desired winnings. Paying the rate by a coin mechanism. 2. The method according to claim 1, further comprising:
By the microprocessor, (h) randomly selecting the nodes of the first layer of the tree structure, (i) determining whether the selected node is a terminal node or a descending node, and (j) determining the descending node. And then descending to the associated lower hierarchy in the tree structure and repeating steps (h) and (i) for such lower hierarchy until the terminal nodes are determined, and (k) the terminal nodes. The selected symbol set is displayed on the pay line by the reel motor and the corresponding prize is distributed by the coin mechanism. 3. The method of claim 1, wherein step (c) includes the substep of selecting a symbol and the frequency of each symbol for each reel by a microprocessor. 4. The method of claim 1, wherein said step (b) is the betting rate for each group divided by the number of possible combinations of multiple reels of the group by the total number of possible combinations of multiple reels. A method comprising the sub-step of calculating by a microprocessor based on. 5. The method of claim 1, wherein each level of the tree structure corresponds to a size that does not exceed the levels above it, thereby combining multiple reels within the tree structure. How to get the desired winning percentage by accurately arranging. 6. The method according to claim 5, wherein the first hierarchy of the tree structure has 10 nodes. 7. The method of claim 5, wherein there are 10 nodes in at least one hierarchy of the tree structure. 8. The method according to claim 5, wherein at least some hierarchies of the tree structure have different numbers of nodes. 9. The method according to claim 5, wherein at least one layer of the tree structure has a lower layer which is connected via a descending node and has a size degree equal to or higher than the lower layer. However, it is possible to add and display a combination of a plurality of reels in a certain symbol group without changing the desired winning rate. 10. The method according to claim 2, wherein said step (e) determines the number of nodes N of a hierarchy, and randomly selects one number from 1 to N to select nodes. A method including steps. 11. A method for operating a reel slot machine to achieve a desired bet rate for a reel slot machine, comprising: (a) all possible reels for terminal nodes of a subdivision branch tree look-up table. The assignment of stop position combinations is stored in a memory device by a microprocessor, and this table has a main layer and a plurality of lower layers, each layer having a plurality of terminal nodes and a plurality of descending nodes except for the lowest layer. With the end node containing the reel stop position combination and the descending node leading to the next lower level in the table, and (b) the microprocessor randomly selects one of the nodes in the main level. , A step of determining whether the node is a terminal node or a descending node, and (c) if the microprocessor determines that the node is a descending node, the next lower layer is terminated. The step (b) is repeated as necessary until the end contact is selected, and (d) the microprocessor displays the reel stop position combinations assigned to the selected end nodes on the reels of the reel type slot machine. And paying any prize money associated with the combination. 12. The method of claim 11, wherein step (a) classifies all possible reel stop position combinations into symbol groups by a microprocessor, each symbol group being combined into the group. A method comprising the steps of storing different prize pool allocations for each symbol group in a memory device by a microprocessor with different prize pools. 13. The method of claim 12, wherein step (a) is the bet rate for each group divided by the number of reel stop position combinations for the group by the total number of possible reel stop position combinations. A method comprising the sub-step of calculating by a microprocessor based on. 14. The method of claim 11, wherein step (a) classifies all possible reel stop position combinations by a microprocessor into symbol groups, each symbol group being combined by the microprocessor into the group. With different winnings made, and including the sub-step of selecting the symbols and the frequency of each symbol for each reel by a microprocessor. 15. The method of claim 11 wherein each tier of the table corresponds to a size that does not exceed a tier above it, thereby allowing possible reel stop position combinations within the table. How to place them precisely to get the desired bet percentage. 16. The method of claim 15, wherein there are 10 nodes in the first hierarchy of the table. 17. The method according to claim 15, wherein at least one layer of the table has 10 nodes. 18. The method of claim 15, wherein at least some hierarchies of the table have a different number of nodes. 19. The method according to claim 15, wherein at least one layer of the table has a lower layer which is connected through terminal nodes and has a size degree equal to or higher than the layer. , Without changing the desired prize rate
A method that allows you to display additional reel stop position combinations for a symbol group. 20. The method according to claim 11, wherein said step (b) determines a node number N of a hierarchy by a microprocessor and randomly selects one integer from 1 to N. A method comprising the substep of selecting. 21. A method of operating a multiple reel slot machine by setting a probability of selecting a symbol to be displayed on a pay line of the multiple reel slot machine, comprising: (a) a description of the symbol for each reel. Is stored in a memory device by a microprocessor, and (b) a symbol look-up table for each reel is prepared in the memory device by the microprocessor, and each look-up table includes a tree structure including a hierarchy in which the probability drops. And each lower layer has terminal nodes capable of storing individual symbols and descending nodes connected to lower layers, each lower layer having a reduced probability of occurrence; In the memory device, the processor assigns a symbol for each reel to the corresponding node at the end node position in the tree structure corresponding to the desired winning probability. Storing in a lookup table. 22. The method of claim 21, wherein the microprocessor further randomly selects numbers corresponding to terminal and descending nodes of each branch for display on a payline of the slot machine. A method comprising step (d) of randomly selecting symbols. 23. The method of claim 22, wherein said step (d) comprises: (i) a substep of randomly selecting a node of the first hierarchy of the tree structure by a microprocessor; and (ii) selecting. A sub-step for the microprocessor to determine if the node is a terminal node or a descending node; and (iii) if it is a descending node, the microprocessor descends to the relevant lower hierarchy in the tree structure and On the other hand, a substep of repeating the above substeps (i) and (ii) until the terminal node is determined, and (iv) a substep of storing the symbol assigned to the selected terminal node for display by the microprocessor. And (v) a substep of repeating the substeps (i) to (iv) for each reel of the slot machine. 24. The method of claim 21, wherein step (a) includes the sub-step of selecting a symbol and the frequency of each symbol for each reel by a microprocessor. 25. The method of claim 23, wherein the sub-step (i) is by a microprocessor
A method comprising the sub-step of determining the number of nodes (N) in a hierarchy and randomly selecting a number from 1 to N to select nodes. 26. The method of claim 21, wherein each reel includes a different set of symbols and a separate look-up table is stored in a memory device for each reel. 27. A method of operating a reel type slot machine by selecting a combination of symbols to be displayed on a pay line of the reel type slot machine, comprising: (a) subdivision branch included in a memory device for each reel. All possible symbols are assigned by the microprocessor to the terminal nodes of the tree lookup table, the table has a main layer and a plurality of lower layers, each layer having a plurality of terminal nodes and except the bottom layer. , A plurality of descending nodes, the terminal node including a symbol, and the descending node connecting to the next lower layer in the table, and (b) the microprocessor randomly selects one of the nodes of the main layer. The step of selecting and determining whether the selected node is a terminal node or a descending node, and (c) If it is determined that the node is a descending node, it is necessary to select the terminal contact for the next lower layer as necessary. And then repeating the step (b) by the microprocessor, (d) storing the symbols assigned to the selected end nodes in the memory device for display, and (e) for each reel. , The steps (b) to (d)
And randomly selecting a combination of symbols. 28. The method of claim 27, wherein said step (b) determines the number of nodes (N) of the hierarchy, and randomly selects one integer from 1 to N to select the nodes. A method including the substeps of: 29. A reel controller, each comprising a plurality of reels bearing a plurality of symbols, for moving the plurality of reels to display one of the plurality of symbol combinations on a payline; a microprocessor; In a dual reel slot machine having an operation control system including a memory device for controlling the operation of the slot machine and a coin mechanism for paying a prize, the dual reel slot machine is provided with a desired prize rate. (A) storing a description of the symbols for each reel in a memory device by a microprocessor; and (b) classifying all possible combinations of multiple reels into symbol groups by the microprocessor. And (c) assigning a desired winning percentage to each symbol group by means of a microprocessor. (D) a look-up table arranged in a tree structure including hierarchies with a reduced probability, each hierarchies storing combinations of multiple reels. A step of preparing a look-up table having stored terminal nodes and descending nodes connected to a lower hierarchy in a memory device by a microprocessor, and (e) a desired prize at a terminal node position of a tree structure of the look-up table. Storing a combination of a plurality of reels corresponding to the rate in the memory device by the microprocessor, and
Random selection of numbers corresponding to terminal nodes and descending nodes by a microprocessor, and (g) Simultaneously moving the reels and displaying a combination of symbols on multiple reels corresponding to the selected terminal nodes on the pay line. And paying the resulting, random, nearly desired winnings percentage by a coin mechanism.