JP2008220746A - Game machine, method for its fraudulence prevention and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To disable games for blocking the fraudulence when detected by detecting a so-called solenoid tampering (fraudulence). <P>SOLUTION: The game machine with a winning lottery means which carries out a lottery from a signal from a start switch to determine winning from the result of the lottery is provided with a random number monitoring device which compares the random number value for lottery extracted with the random number extracted before to detect that the random number value the same as or approximate to previous one is extracted from the result of the comparison. When the random number value extracted is the same or approximate continuously, the fraudulence is determined (YES at S5). With the determination of the fraudulence, an isolation mechanism is driven (S6) to block the detection of the operation of the start switch. This processing disables the game handled by a fraudster, thereby staving off the fraudulence. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a gaming machine, a gaming machine fraud prevention method, and a program. In particular, the present invention relates to a technique for preventing an illegal act related to pressing of a start switch.

  A gaming machine such as a slot machine is provided with a slot for medal, and the player can enjoy a game by inserting a predetermined number of medals. The medals necessary for the game can be borrowed by a medal lending machine provided in the game hall, and the game can be started by inserting it into the medal slot of a desired gaming machine.

The operation of the conventional gaming machine was as follows.
First, when the start switch is operated, the start switch is turned on. In response to this, a lottery process is performed by the winning lottery means inside the gaming machine. Here, when a predetermined combination is won, a winning flag is set. The rotating reel starts to rotate. When the stop switch is operated, the stop switch is turned on. Then, the rotation of the corresponding rotating reel is stopped. After the stop switches corresponding to all the rotating reels are operated, whether or not the winning symbols corresponding to the winning flag are aligned on the effective winning line while the winning flag is established, that is, whether or not the winning is confirmed Is determined. When it is determined that the winning is confirmed, a medal corresponding to the winning symbol is paid out.

  For example, when the evaluation of the lottery process is out of place, it is set so that the predetermined symbols are not aligned (so-called kicking), and when winning, the predetermined symbols are aligned on the condition that the stop switch is pressed at a predetermined timing. (So-called pull-in). In other words, only when winning in the lottery process, medals are paid out by winning a winning pattern under a predetermined condition, but when not winning, medals are paid out regardless of how the stop switch is operated. There is no. This is to keep the medal payout at a certain probability. In order to realize this, a random number generator is used in the lottery process.

  A random number generator of a gaming machine generates a random number using a counter, for example. The random numbers generated in this case have a certain degree of regularity, and therefore have a predictable aspect. For example, as shown in FIG. 13, the random number generator (counter) sequentially generates numerical values from 0000 to FFFF (hexadecimal) at a constant cycle. The output of the counter, which is constantly changing, is expressed by assuming that the start switch is pressed down (in FIG. 13, the signal rise timings t1 and t3: the start switch press signal is positive logic, and the signal goes high when pressed. Latching is performed, and a lottery process is performed using this as a random value. In the example of FIG. 13, the value of code A is output as a random value at timing t1, and the value of code B is output as a random value at timing t2. The updating period T of the counter output is very short, and even if it is known that the random number value has periodicity, it is difficult for the human industry to obtain the desired value. The counter output could be regarded as a pseudo-random number.

  However, the possibility of increasing the lottery probability beyond a predetermined value by skillfully operating the start switch using some device could not be denied. For example, a method (so-called “solenoid goto”) is known in which a start switch is turned on by hooking a wire on the start switch and pulling it down at regular time intervals by a fraudulent device including a solenoid coil. ing. If the fraudulent device is used, the pressing interval of the start switch can be adjusted very accurately (for example, with an accuracy of about several milliseconds). Using this, fraudulent acts that continuously acquire random numbers (a role with a large random number width, which is relatively easy to win, such as continuously taking a bell, increasing medals, or a specific role performing a release lottery in a stock machine) Unauthorized acts, such as winning and releasing bonuses, are gaining popularity.

  In the example of FIG. 13, since the repetition cycle of the random number generator (counter) is T, the same random value can be obtained in principle by setting the push switch depression cycle TS to an integer multiple of T. . It seems that cheating is performed by adjusting the cycle of pressing the start switch by the cheating device. Although it is forbidden to operate the start switch with the help of any device, the detection is not easy. It is required to take measures on the gaming machine side.

  There are the following technologies to deter fraud.

JP, 2006-230893, A It is indicated that the random number value acquired for winning lottery is monitored, and it is judged that it is fraudulent when the same random number is acquired continuously. JP, 2006-255197, A In order to prevent improperly changing the setting of a gaming machine, it is described monitoring a photo sensor which detects opening and closing of a front door.

  According to Patent Document 1, it is not possible to disable a fraudulent player's game simply by issuing an alarm when it is determined to be a fraudulent act or shooting a player with a camera. According to Patent Literature 2, although the game can be disabled, the cheating that can be detected is related to the setting change.

  The present invention has been made to solve the above-mentioned problems, and provides a gaming machine capable of disabling the game of a fraudster when it is determined as a so-called solenoid goto, a fraud prevention method for the gaming machine, and a program. The purpose is to do.

The present invention, in a gaming machine comprising a winning lottery means for performing a lottery based on a signal from a start switch and performing a winning determination based on the result of the lottery,
The start switch is provided on the front surface of the gaming machine, receives an operation of the player at one end, and moves between a predetermined reference position and a swing position separated from the operation shaft; A sensor that is provided at the other end of the operation shaft and detects whether the operation shaft is at the reference position; and a separation mechanism that separates the sensor from the other end of the operation shaft;
The winning lottery means includes a random number generator for generating a random number for lottery, a random number extractor for extracting a random number generated by the random number generator based on a signal of the start switch, and a correspondence between a random value related to the lottery and the winning A winning determination table that stores the relationship in advance, and a determination unit that determines whether or not the random number extracted by the random number extractor has been won with reference to the winning determination table;
Comparing the random number value extracted by the random number extractor with a previously extracted random value, and detecting that the same or approximate random number value is extracted based on the comparison result; and
And a separation mechanism driving unit that drives the separation mechanism when it is detected by the random number monitor that the same or similar random number values are extracted.

A timing prediction unit that predicts a timing of an operation on the operation axis by a player and determines a first timing for enabling the separation mechanism and a second timing for disabling the separation mechanism based on a prediction result;
The separation mechanism driving unit may enable the separation mechanism only between the first timing and the second timing by the prediction unit.

  For example, the timing prediction unit obtains a time interval for an operation on the operation axis by the player, and predicts an operation timing on the operation axis by the player based on the time interval.

  For example, the timing prediction unit stores the random value extracted by the random number extractor, and the random number generator detects the random number based on a range of random numbers generated by the random number generator and a predetermined repetition period. A timing for outputting a numerical value is obtained, and based on the timing, a timing of an operation on the operation axis by the player is predicted.

  For example, the random number monitor continuously monitors the extracted random value, and the difference between the previously extracted random value and the current random value is zero or smaller than a predetermined threshold value. However, when the number of occurrences exceeds a predetermined number of times or a predetermined frequency, it is determined that the same or similar random value is extracted.

  For example, the random number monitor continuously monitors the extracted random value, and the state where the difference between the predetermined reference value and the random value is zero or smaller than a predetermined threshold value, When the number of occurrences exceeds a predetermined number of times or a predetermined frequency, it is determined that the same or similar random value is extracted.

The present invention is a gaming machine that performs a lottery based on a signal from a start switch and performs a win determination based on a result of the lottery, and a sensor that detects on / off of the start switch is separated from the start switch. A method for preventing fraud in a gaming machine having a separation mechanism to be invalidated,
Generating random numbers for lottery;
Extracting the generated random number based on the signal of the start switch;
A step of determining whether or not the extracted random number value has been won with reference to a winning determination table that stores in advance a correspondence relationship between the random value related to the lottery and winning;
Comparing the extracted random value with a previously extracted random value;
When it is determined that the same or approximate random number value is extracted based on the obtained comparison result, predicting the operation timing for the operation axis by the player;
Determining a first timing for enabling the separation mechanism and a second timing for disabling the separation mechanism based on the predicted operation timing;
Enabling the separation mechanism at the first timing and disabling the separation mechanism at the second timing.

The present invention is a program for causing a computer to execute the above method.
The program according to the present invention is recorded on a recording medium, for example.
Examples of the medium include EPROM devices, flash memory devices, flexible disks, hard disks, magnetic tapes, magneto-optical disks, CDs (including CD-ROMs and Video-CDs), DVDs (DVD-Videos, DVD-ROMs, DVD-s). RAM), ROM cartridge, RAM memory cartridge with battery backup, flash memory cartridge, nonvolatile RAM cartridge, and the like.

  A medium is a medium in which information (mainly digital data, a program) is recorded by some physical means, and allows a processing device such as a computer or a dedicated processor to perform a predetermined function. is there.

  The present invention compares the extracted random number value with the previously extracted random number value, and when it is determined that the same or similar random value is extracted based on the obtained comparison result, the separation mechanism is enabled. The operation of the start switch is disabled, and as a result, it cannot be operated. As a result, no profit is given to the fraud using the fraudulent device, and the fraud can be suppressed.

Embodiment 1 of the Invention
A gaming machine according to Embodiment 1 of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of a gaming machine (also called a slot machine or a revolving gaming machine).
A player who wants to enjoy a game with the slot machine 10 first borrows a medal as a game medium from a medal lending machine (not shown) or the like, and inserts a medal directly into the medal insertion slot 100 of the medal insertion device. The medal slot 100 is provided at a substantially central height in front of the slot machine 10.

  The slot machine 10 has a square box-shaped housing 11. A square window-like display window 12 facing the player side is formed in the central part and the upper part of the casing 11, respectively. A symbol display window 13 through which the symbols 61 of the three rotary reels 40 can be seen is formed slightly to the left of the center display window 12. The bet switch 16 is a switch located below the rotary reel 40, and reduces the number of stored medals inserted and stored in the medal insertion slot 100 to replace the medal insertion. The settlement switch 17 is a switch located obliquely below the rotating reel, and pays out the stored inserted medal. The start switch 30 is a lever positioned obliquely below the rotary reel 40 and starts driving the reel unit 60 on condition that a game medal is inserted or the bet switch 16 is inserted. The stop switch 50 is for stopping the driving of the reel unit 60. The reel unit 60 is composed of three rotating reels 40. Each rotating reel 40 includes a rotating drum made of a synthetic resin and a tape-like reel tape 42 attached around the rotating drum. On the outer peripheral surface of the reel tape 42, a plurality of (for example, 21) symbols 61 are displayed. Reference numeral 62 denotes a liquid crystal display unit for performing various effects.

  Inside the slot machine 10, as will be described later, a control device (main board) for controlling the overall operation of the slot machine 10 is incorporated. The control device is configured around a CPU and includes a ROM, a RAM, an I / O, and the like. Then, the CPU (processing unit) is operated by reading the program stored in the ROM (storage unit) in response to the player's operation. Specifically, the CPU operates the start switch 30 and the stop switch 50. Based on this, the rotation and stop of the rotary reel 40 are controlled, and the display of lamps, speakers, and the like are controlled. Temporary data necessary for the operation of the CPU is RAM (storage unit: RAM is generally a volatile memory, and data is lost in principle when the power is turned off. A backup power source such as a battery may be prepared. In this case, data is not lost even if the power is cut off). The CPU performs a predetermined operation in accordance with a program recorded in the ROM, records temporary data necessary for processing in the RAM, and reads out and refers to the recorded data as necessary.

  The start switch 30 is a lever that is positioned obliquely below the rotary reel 40 as described above. The start switch 30 can be obtained on the condition that a game medal is inserted or the bet switch 16 is inserted or according to a winning determination. "Replay)" is to start driving the reel unit 60 on condition that a predetermined time has elapsed since the previous game.

  The stop switch 50 is for stopping the driving of the reel unit 60 as described above. Specifically, the stop switch 50 includes three switches corresponding to each rotary reel 40, and one stop switch 50 is disposed below each rotary reel 40. The operation of the stop switch 50 corresponding to the rotating reel 40 is set to stop the rotation of the corresponding rotating reel 40.

  When the start switch 30 is operated on the condition that the medal is inserted or the bet switch 16 is inserted, or on the condition that a predetermined time has elapsed from the previous game at the time of the “replay”, the reel unit 60 is driven, and the three The rotary reel 40 starts to rotate. Thereafter, when one of the stop switches 50 is operated, the rotation of the corresponding rotary reel 40 is stopped. When all three stop switches 50 are operated, the rotation of the three rotary reels 40 is stopped. At this time, if a predetermined symbol 61 on the effective pay line of the display window 13 stops, it is determined that the winning is made, and a predetermined number of medals are paid out through a hopper unit (not shown). In addition, you may credit instead of paying out medals.

  When the control device (main board 1 described later) controls the rotation and stop of the rotary reel 40 based on the operation of the start switch 30 and the stop switch 50, the winning qualification is obtained based on a predetermined internal lottery probability. Including a winning lottery means for performing a lottery for determining whether or not the player has won. A winning flag is established when the internal lottery result by the winning lottery means is a winning, and a winning is made on condition that the combination of the stopped symbols of the rotating reel 40 matches a predetermined winning symbol while the winning flag is established. Is determined, and the player is given a profit such as paying out medals or a special game advantageous to the player.

  FIG. 2 is a block diagram showing an electrical schematic structure of the slot machine 10. In this figure, the display about the power supply system is omitted. The slot machine 10 includes a main substrate 1 and a sub-substrate 2 that operates in response to commands from the main substrate 1 as main processing devices. At least the main substrate 1 is accommodated inside the case so that it cannot be contacted from the outside, and is sealed so that a trace remains when the substrates are removed.

On the main board 1, a random number is extracted based on a signal from the start switch 30, a winning lottery means 1a for performing a winning determination based on the extracted random number value, and the presence or absence of fraudulent activity by monitoring the extracted random number value. A fraud detection unit 1b for determining is provided. When the fraud detection unit 1b determines that an illegal act has been performed, the fraud detection unit 1b drives the separation mechanism 30a provided in the start switch 30 to separate the sensor that detects the depression of the start switch 30 from the switch. However, it is impossible to detect the on / off state.
The winning lottery means 1a, the fraud detector 1b, the start switch 30 and the separation mechanism 30a will be described in detail later.

  The main board 1 is for performing an internal lottery in response to a player's operation, and processing such as reel rotation / stop and medal payout. The main board 1 includes a CPU that performs a control operation according to a preset program, a ROM that is a storage unit that stores the program, and a RAM that temporarily stores processing results and the like.

  The sub-board 2 is for receiving a command signal from the main board 1 and notifying the result of the internal lottery and performing various effects. The sub-board 2 includes a CPU that performs a control operation according to a preset program corresponding to the command signal, a ROM that is a storage unit that stores the program, and a RAM that temporarily stores processing results and the like.

  The sub-board 2 receives a command from the main board 1 and performs processing such as rendering according to the command. The flow of commands is only one from the main board 1 to the sub board 2, and conversely, no command or the like is issued from the sub board 2 to the main board 1.

  The main board 1 includes a start switch 30, a stop switch 50, a reel drive unit 70, a reel position detection circuit 71, a hopper drive unit 80, a hopper 81, and a medal detection unit for counting the number of medals paid out from the hopper 81. 82 is connected. A peripheral substrate (local substrate) such as a control substrate 200 of the liquid crystal display unit 62, a speaker 201, and an LED substrate 202 is connected to the sub substrate 2. Hereinafter, these peripheral substrates / devices except for the start switch 30 and the stop switch 50 will be described.

  The reel driving unit 70 is a circuit that drives a stepping motor (not shown) that rotationally drives the three reels 40. Each stepping motor is subjected to 1-2 phase excitation by the reel drive circuit 70 and rotates once when a drive signal having a predetermined number of pulses is supplied.

  The reel position detection circuit 71 is provided in the vicinity of the reel 40, receives an output pulse signal from a photo interrupter (not shown) for detecting the rotation position of the reel 40, detects the rotation position of each of the three reels 40, and detects it. A signal is output. A photo interrupter (not shown) detects a shielding plate provided on each reel 40 and generates a reset pulse every time each reel 40 rotates once. This reset pulse is given to the CPU of the main board 1 via the reel position detection circuit 71. In the RAM of the main board 1, a count value corresponding to the rotation position within one rotation range is stored for each reel 40, and when the CPU receives the reset pulse, the count value formed in the RAM is stored. Clear to “0”. By this clearing process, the deviation generated between the movement display of each symbol and the rotation of each stepping motor is eliminated every rotation.

  The hopper driving unit 80 is a circuit that drives a motor of a hopper 81 that stores medals and pays out the number of medals corresponding to the designated winning.

  The medal detection unit 82 is for counting the number of medals paid out from the hopper 81. The CPU of the main board 1 stops driving by the hopper driving unit 80 when the actually paid out medal count value received from the medal detection unit 82 reaches the predetermined payout number data corresponding to the winning. Finish paying out. A predetermined number of medals are paid out to the player by the hopper driving circuit 80 and the medal detection unit 82 based on a winning obtained as a result of the game.

The liquid crystal control board 200 is a circuit for driving the liquid crystal display unit 62.
The speaker 201 is for generating sound such as voice and sound effects.
The LED substrate 202 is a circuit for driving a display lamp and a back lamp (not shown).

  The liquid crystal display unit 62 controlled by the liquid crystal control board 200 and the LED board 202 including the speaker 201 and the display lamp constitute an effect display device. This effect display device is for notifying a player of a prize or the like, or for teaching a user a specific small role during a certain game with some action during a so-called assist time (AT).

  The ROM of the main board 1 stores game processing procedures executed in the slot machine 10 as a sequence program, and stores a winning probability table, a symbol table, a winning symbol combination table, and the like. Has been. The winning probability table is divided so that the random number values extracted by the random number generator (random number generator and random number extractor described later) are divided into each winning mode, and a certain range of numerical values generated by the random number generator. Data for dividing the random number extracted from the inside into each winning mode is stored. That is, the winning probability table has an area divided for each winning mode corresponding to the entire area of random numbers taken by the random number generator. For example, a range of 0 to a certain number is divided into a plurality, one division (region) is excluded, and the other division (region) is set as winning 1, winning 2,.

  The random number generator has a random number generation function that generates pseudo random numbers by rapidly updating numerical values in a certain range, and a sampling function that extracts an arbitrary random number value from the generated random numbers in response to the player's operation. It is to be prepared. As a specific example, it is composed of a counter and a latch. In this specification, “random number” means the whole series of values generated by the random number generator, and “random number” means any value arbitrarily extracted from the series of random numbers. And For example, when the random number generator generates arbitrary numerical values such as r1, r2, r3, r4, r5,..., The whole of r1, r2, r3, r4, r5,. (To be precise, a random number sequence), and a sampled value (for example, r3, usually one value is extracted) is a random value. In the following description, “random number value” is also referred to as “random number data”.

  The extracted random number data is collated with each of the winning determination area data divided for each winning mode in all areas corresponding to the random number generated from the random number generator, and the extracted random data is assigned to the winning mode to which the extracted random number data belongs. The corresponding winning is determined. For example, it is determined which category (region) in the winning probability table the extracted random number value belongs to, and if the category is, for example, a category of winning 1, it is determined as “winning 1”. Similarly, if the extracted random number value belongs to a category (area) that is out of the winning determination table 6, it is determined as “out”. For example, when the evaluation of the lottery process is out of place, it is set so that the predetermined symbols are not aligned (so-called kicking), and when winning, the predetermined symbols are aligned on the condition that the stop switch is pressed at a predetermined timing. (So-called pull-in). And if predetermined symbols are prepared, medals corresponding to winning symbols are paid out. Various winnings occur under the probability according to the data setting of the winning probability table, and the symbol stop control is performed. For example, the business hours of the day are not affected by the skill of the player. The total medal payment rate is maintained almost constant.

  FIG. 3 is a block diagram of the winning lottery means 1a and the fraud detector 1b according to the first embodiment of the invention.

  The winning lottery means 1a includes a random number generator 3, a random number extractor 4, a determining unit 5, and a winning determination table 6 shown in FIG. At least some of the functions of the winning lottery means 1a (for example, the determination unit 5 and the winning determination table 6) are realized by executing the program stored in the ROM of the main board 1 by the same CPU or by hardware such as an IC. Is done.

  The fraud detection unit 1b stores a random number value extracted last time, compares the stored random number value with the random value extracted by the random number extractor 4, and a random value monitor 7 When the previous random number value matches the random value extracted this time by the random number extractor 4 or when the difference between them is smaller than a predetermined threshold value, the separation mechanism 30a is driven to start the start switch 30. A separation mechanism drive unit 8 is provided which makes it impossible to detect the on / off state by separating a sensor for detecting depression of the switch from the switch.

  The random number generator 3 generates a random number for winning lottery within a predetermined area. For example, a counter that receives a clock signal and generates an arbitrary numerical value with a predetermined probability in a range of 0 to a certain number (for example, 0000 to FFFF (hexadecimal)) according to the clock signal.

  The random number extractor 4 extracts the random number generated by the random number generator 3 at the operation timing of the start switch 30. The random number generator 3 continuously generates random numbers at predetermined intervals, and a part of them is extracted by the random number extractor 4.

  The winning determination table 6 has an area divided for each winning mode corresponding to the entire area of random numbers taken by the random number generator 3. For example, a range of 0 to a certain number is divided into a plurality, one division (region) is excluded, and the other division (region) is set as winning 1, winning 2,.

  The determination unit 5 refers to the extracted random number data extracted by the random number extractor 4 with the lottery probability data in the winning determination table 6. That is, the extracted random number data is collated with each of the winning determination area data divided for each winning mode in the entire random number region taken by the random number generator 3, and the winning corresponding to the winning mode to which the extracted random number data belongs is determined. To decide. For example, it is determined which category (region) of the winning determination table 6 the extracted random number value belongs to, and if the category is, for example, a category of winning 1, it is determined as “winning 1”. Similarly, if the extracted random number value belongs to a category (area) that is out of the winning determination table 6, it is determined as “out”.

  For example, when the evaluation of the lottery process is out of place, it is set so that the predetermined symbols are not aligned (so-called kicking), and when winning, the predetermined symbols are aligned on the condition that the stop switch is pressed at a predetermined timing. (So-called pull-in). And if predetermined symbols are prepared, medals corresponding to winning symbols are paid out.

  The random number monitor 7 compares the previous random value with the random value extracted by the random number extractor 4, and when the random value extracted by the random number extractor 4 matches the previous random value or the difference between them is When it is smaller than a predetermined threshold value, it is determined as an illegal act, and the determination result is output to the separation mechanism drive unit 8.

  The separation mechanism drive unit 8 outputs a signal to the separation mechanism 30a based on the signal from the random number monitor 7, and makes it impossible to detect the pressing by pulling the sensor away from the start switch 30.

There are the following methods (1) to (3) as conditions for determining an illegal act. Details will be described later.
(1) The previous random number value is simply compared with the current random number value, and when they match or when the difference between them is smaller than a predetermined threshold value, it is determined as an illegal act.
(2) The extracted random number value is continuously monitored, and a state in which the difference (difference) between the previous random number value and the current random number value is zero or smaller than a predetermined threshold value is determined in advance. If it occurs more than the specified number of times, it is determined as an illegal act.
(3) The extracted random number value is continuously monitored, and a state in which the difference between the predetermined reference value and the random number value becomes zero or becomes smaller than a predetermined threshold is a predetermined number of times. If it occurs beyond this, it is determined to be fraudulent.

  The structure of the start switch 30 will be described with reference to FIGS.

FIG. 4 is an explanatory diagram of the start switch 30 according to the first embodiment of the invention. FIG. 4 shows a state (normal operation state) in which the separation mechanism 30a is not driven and the sensor 134c is in a position where the pressing of the start switch 30 can be detected. 4A is a view of the start switch 30 as viewed from above the gaming machine, and FIGS. 4B and 4C are cross-sectional views of the start switch 30 taken along the line AA in FIG. 4A. Yes, (b) shows the non-operating time (off time), and (c) shows the operating time (on time). The start switch 30 is supported so as to move up and down around a fulcrum 134d. Here, “upper” means the direction of the upper end of the gaming machine, and “lower” means the direction of the lower end of the gaming machine. “Upper” and “Lower” are normal high and low positions as viewed from the start switch 30. Both ends of the lever 134b move in the opposite directions around the fulcrum 134d. Unless otherwise specified, when the knob 134a is moved "down", the start switch 30 or the lever 134b is moved "down". .
In these figures, reference numeral 130 denotes a gaming machine door.

  The start switch 30 detects, for example, a spherical knob 134a that is touched directly by the player, a lever (for example, a bar-shaped member) 134b that is a movable portion that is movable when the knob 134a is operated, and a movement of the lever 134b. A sensor 134c for outputting an hour signal, and a fulcrum 134d for supporting the lever 134b in the middle thereof (for example, at the door 130). The sensor 134c is, for example, a photo interrupter that is an optical sensor. In the photo interrupter, a light emitting unit 134c-LED and a light receiving unit 134c-PD are arranged to face each other in a case having a detection groove, and an object passing between the detection grooves is detected without contact.

  Further, as the separation mechanism 30a, a solenoid 30a-1 provided on the back surface (inside the game machine) of the sensor 134c, and the solenoid 30a-1 protrudes from the solenoid 30a-1 when not driven, and enters the solenoid 30a-1 when driven. And a bar (bar-shaped member) 30a-2 to be drawn. For example, when a coil spring is wound around the bar 30a-2 and the solenoid 30a-1 is not driven, the bar 30a-2 is projected by the elastic force. The end of the bar 30a-2 is connected to the sensor 134c, and the sensor 134c moves as the bar 30a-2 advances and retreats. Further, when the solenoid 30a-1 is driven and the bar 30a-2 is pulled and the sensor 134c moves, the shielding member 30a is provided so as to interrupt between the light emitting unit 134c-LED and the light receiving unit 134c-PD. -3. If the solenoid 30a-1 is driven, the light is shielded by the shielding member 30a-3, and the start switch 30 remains off regardless of the operation by the player. In FIG. 4, since the solenoid 30a-1 is not driven, the operation of the start switch 30 is normal.

  When the start switch 30 is not operated (off), as shown in FIG. 4B, the end of the lever 134b (the end opposite to the knob 134a is located inside the door 130). The light is interrupted between the light emitting unit 134c-LED and the light receiving unit 134c-PD to block the light.

  When the start switch 30 is operated (on), the knob 134a is pushed down as shown in FIG. 4 (c). The start switch 30 rotates around a fulcrum 134d provided in the middle of the start switch 30, and the end of the lever 134b (the end opposite to the knob 134a) rises between the light emitting unit 134c-LED and the light receiving unit 134c-PD. As a result, the light receiving unit 134c-PD receives the light from the light emitting unit 134c-LED and outputs a signal. At this time, it is determined that the start switch 30 has been operated (turned on).

  FIG. 5 shows the start switch 30 according to the first embodiment of the invention. FIG. 5 shows a state in which the separation mechanism 30a is driven and the sensor 134c is pulled away from the start switch 30 so that the pressing of the separation mechanism 30a cannot be detected (a state when an illegal act is detected). 5A is a view of the start switch 30 as viewed from above the gaming machine, and FIGS. 5B and 5C are cross-sectional views of the start switch 30 taken along line AA in FIG. 5A. Yes, (b) shows the non-operating time (off time), and (c) shows the operating time (on time).

  When the separation mechanism 30a is activated and the bar 30a-2 is pulled into the solenoid 30a-1, the sensor 134c moves to the inside of the gaming machine as shown in FIGS. 5 (a) to 5 (c), and the lever 134b While separating from the end, the shielding member 30a-3 interrupts between the light emitting unit 134c-LED and the light receiving unit 134c-PD, and continues to block light. Then, as shown in FIG. 5C, even if the knob 134a is pressed, the light is blocked regardless of the movement thereof, and the light receiving unit 134c-PD does not receive the light of the light emitting unit 134c-LED, and the start switch 30 Remains off. That is, when the separation operation is performed, even if the start switch 30 is pressed, the switch is not turned on, and the game is not started.

  On the other hand, as shown in FIG. 4, when the separation mechanism 30a is disabled, the switch is turned on by pressing the start switch 30 as usual, and the game is started.

  Various power transmission mechanisms including one or a plurality of cams, links, screws, and the like may be interposed between the solenoid 30a-1 and the bar 30a-2. The same applies to between the bar 30a-2 and the sensor 134c. As a drive source for the separation mechanism 30a, a motor can be used instead of the solenoid 30a-1. The shape of the bar 30a-2 is not limited to a linear pin shape, and may be a U shape, a Y shape, or the like as described above.

  Next, the operation of the gaming machine according to the first embodiment of the present invention will be described with reference to the flowchart of FIG.

  When the start switch 30 is pressed (YES in S2), random number values are extracted by the random number extractor 4 based on the output of the switch 30 (S3).

  Based on the extracted random number value, the determination unit 5 performs a winning determination (S4). Since this process is publicly known, its detailed description is omitted.

  It is determined whether or not the extracted random number value is close to the previous time, that is, whether or not the current random number value matches the previous random value or whether the difference between them is smaller than a predetermined threshold (S5). . If not approximate (NO in S5), the process returns to S2.

  When approximate (YES in S5), the separation mechanism 30a is driven so that the start switch 30 cannot be detected. The structure and operation of the separation mechanism 30a are as described above.

  In this way, the random value used in the game is compared with the random value used in the internal lottery of the previous game, and it is determined whether the difference between the two is within a certain range. Can be detected. The correct start switch operation by the player always fluctuates, and the same or approximate random number values are not extracted continuously. This occurs only in the case of fraud using a machine such as a solenoid. When cheating is detected, the start switch 30 cannot be turned on by the separation mechanism 30a. Therefore, the cheating person cannot play a game and cannot receive profits from cheating.

A specific operation of the random value monitor 7 will be described.
The embodiment of the present invention is for preventing an illegal act of continuously obtaining a desired random number value using an illegal act device. Therefore, the determination criterion may be whether or not the same or similar random number value is obtained continuously to the extent that it is almost impossible to obtain it by operating the normal start switch 30. Specifically, the following criteria (1) to (3) are determined.

(1) Simply compare the previous random number value with the current random number value, and when they match or when the difference between them is smaller than a predetermined threshold, the separation mechanism 30a is operated.
(Current random value)-(Previous random value) = 0
Or (current random value)-(previous random value) <(threshold)
When this condition is satisfied, the separation mechanism 30a is operated.
For example, the random number monitor 7 calculates the left side of the above equation, compares the result with the threshold value, and drives the separation mechanism 30a to the separation mechanism drive unit 8 when (received value) <(threshold value). Send a command to
Since the random number generator 3 generates random numbers at a high speed, the probability that the current random number value and the previous random number value are exactly the same by an operation by a general player may be regarded as zero. The same applies when the difference is very small (for example, less than 1%).
This method is simple to process and easy to implement.

(2) The extracted random number value is continuously monitored, and a state in which a difference (difference) between the previous random number value and the current random number value becomes zero or becomes smaller than a predetermined threshold value is determined in advance. When it occurs over the given number of times, the separation mechanism 30a is operated.
This method will be described with reference to FIG.
FIG. 7A is a graph in which the extracted random number values are plotted in time series. The figure shows 13 random values. The vertical axis of the graph represents a random value. The random number generator 3 is composed of a counter, and its output repeats a range of 0000-FFFF (hexadecimal). The horizontal axis of the graph indicates time.
FIG. 7B is a graph in which the differences (vertical axis) of the random number values are plotted in time series.
(Random number difference) = (Current random number value)-(Previous random value)
It is.
In FIG. 7B, the vertical axis indicates threshold values Th + and Th−.

  For example, the random value monitor 7 calculates the left side of the above expression, compares the value with the threshold value, and the difference is continuously included in the threshold value Th + and Th− within a certain number of times (for example, five times or more). When this happens, the separation mechanism 30a is operated. In FIG. 7B, since (p) to (t) are continuously included in the range of the threshold values Th + and Th−, at the timing t1 immediately after the random value of (t) is extracted, the separation is performed. The mechanism drive unit 8 enables the separation mechanism 30a.

  This method is more complicated than the method (1) described above, but on the other hand, there is an advantage that an illegal act can be detected reliably. In the above-described method (1), the separation mechanism 30a is not operated unless the difference between the previous and current random numbers is small (for example, less than 1%). Even if a fraudulent act is performed, it cannot be detected unless the fraudster operates “exactly” in accordance with the random number generation cycle. In order to detect fraudulently with certainty, the threshold may be increased (for example, less than 5%), but in this case, an operation of a general player is often mistakenly detected as fraudulent. Thus, increasing the detection probability of fraudulent activity and increasing the probability of erroneously detecting a general player's operation as fraudulent activity (false detection probability) are in a trade-off relationship, and the above-mentioned (1) In this way, it is difficult to improve both at the same time.

  On the other hand, according to the method of (2), both can be improved simultaneously. The random number values by the fraudsters are the same or similar values in succession (parts (p) to (t) in FIG. 7), particularly when fraudulent acts are succeeding. In such a case, the separation mechanism 30a may be operated. In view of the nature of the random value by such an unauthorized person, the detection probability can be increased by increasing the threshold Th in FIG. 7B (for example, 5%), but the false detection probability is not increased. This is because it is almost impossible to obtain a random value that is continuously approximated by an operation by a general player.

  In general, increasing the number of times decreases the false detection probability, but also decreases the detection probability. Increasing the threshold value increases the detection probability, but also increases the false detection probability. In view of such properties, a practically preferable threshold value / number of times may be set. The detection probability according to the method (2) is higher than the detection probability according to the method (1). Regarding the false detection probability, the method (2) is lower than the method (1) and is superior. It can be said that the method (2) improves both the detection probability and the false detection probability of the method (1) at the same time.

  In the above example, whether or not the value is the same or approximated five times consecutively is used as a criterion. Instead, whether or not the value is the same or approximated five times or more out of ten times, that is, predetermined. It is also possible to use whether or not the frequency is exceeded.

(3) The extracted random number value is continuously monitored, and a state in which the difference between the predetermined reference value and the random number value becomes zero or becomes smaller than a predetermined threshold is a predetermined number of times. When it exceeds, the separation mechanism 30a is operated.
This method will be described with reference to FIG.
FIG. 8A is a graph in which the extracted random number values are plotted in time series. The figure shows 13 random values. The vertical axis of the graph represents a random value. The random number generator 3 is composed of a counter, and its output repeats a range of 0000-FFFF (hexadecimal). The horizontal axis of the graph indicates time.
FIG. 8B is a graph in which a difference (vertical axis) between a predetermined reference value and a random value is plotted in time series.

In this method, instead of the difference of (2), a difference from a predetermined reference value (scattering method: hereinafter referred to as “dispersion”) is used.
(Dispersion) = (Random value)-(Reference value)
Except for the above, the method is the same as the method (2).
As a reference value, any value determined as winning is adopted. Since the fraudulent person always aims for winning, a value corresponding thereto (for example, Z = (X + Y) / 2 when the jackpot range of the winning determination table 6 is X to Y) may be set as a reference value.
Like the method (2), the method (3) can improve both the detection probability and the false detection probability, and can prevent the continuation of winning and effectively deter fraud.
Note that, similarly to the case of (2), whether or not the value is the same or approximated 5 times or more out of 10 times (whether or not a predetermined frequency is exceeded) can be used as a criterion.

  According to the first embodiment of the invention, the presence or absence of fraud is determined by monitoring the extracted random number value. When it is determined that fraud is being performed, the separation mechanism separates the sensor from the start switch. In addition, by making it impossible to detect the pressing, it is possible to disable the execution of the game by the fraudster. According to the first embodiment of the invention, it is possible to suppress fraud without causing any profit to the fraudster.

  According to the first embodiment of the present invention, once it is determined to be fraudulent, the game is disabled (interrupted) unless reset by the hall staff. This itself functions in the same way as error notification. If error notification is performed when cheating is detected, there is a possibility that the cheating person may escape. As in the first embodiment of the present invention, if only the start switch is disabled without notifying the error, a fraudulent person can mistakenly recognize that it is a malfunction of the start switch, and can create a situation of notifying the hall staff himself. Also, there is no penalty for lowering the winning probability, so there will be no adverse consequences for a bona fide player after the fraudster has left.

Embodiment 2 of the Invention
In the first embodiment of the present invention, once it is determined to be fraudulent, the game is disabled (interrupted) unless reset by the hall staff. On the other hand, Embodiment 2 of the invention can prevent fraud without interrupting the game.

  FIG. 9 is a block diagram of the winning lottery means and the fraud detector of the gaming machine according to the second embodiment of the invention. 9, parts that are the same as or correspond to those in FIG. 3 are given the same reference numerals, and descriptions thereof are omitted.

  Reference numeral 9 denotes a timing prediction unit that predicts a player's operation on the start switch 30 and enables the separation mechanism 30a only for a predetermined period based on the prediction result. The timing prediction unit 9 determines a first timing for enabling the separation mechanism 30a and a second timing for disabling the separation mechanism 30a. The separation mechanism drive unit 8 starts the separation operation at the first timing by the timing prediction unit 9 and releases the separation operation at the second timing. The separation mechanism drive unit 8 and the timing prediction unit 9 perform the separation operation only at the timing when the cheating person pushes down the start switch 30.

  FIG. 10 is a flowchart of internal lottery processing (including start switch separation operation processing) according to Embodiment 2 of the present invention. The operation of the gaming machine according to the second embodiment of the present invention will be described with reference to this flowchart.

  When the start switch 30 is pressed (YES in S2), random number values are extracted by the random number extractor 4 based on the output of the switch 30 (S3).

  Based on the extracted random number value, the determination unit 5 performs a winning determination (S4). Since this process is publicly known, its detailed description is omitted.

  It is determined whether the extracted random number value is close to the previous time, whether the current random number value matches the previous random number value, or whether the difference between them is smaller than a predetermined threshold (S5). If not approximate (NO in S5), the process returns to S2. The process of S5 has been described above.

When it is approximate (YES in S5), the timing prediction unit 9 predicts the next start lever pressing timing that would be performed by the player (rogue person) (S7).
Then, based on the predicted timing, a first timing for enabling the separation mechanism 30a and a second timing for disabling the separation mechanism 30a are determined. This process will be described in detail later (S8).

  Then, the separation mechanism 30a is driven between the first timing and the second timing so that the start switch 30 cannot be pressed (S9). That is, the separation mechanism 30a is enabled at the first timing to house the bar 30a-2 in the solenoid 30a-1, and the separation mechanism 30a is disabled at the second timing. When disabled, the bar 30a-2 protrudes quickly. The start switch 30 cannot be pressed only in the period from the first timing to the second timing.

  Since the so-called solenoid goat has a feature that the start switch is pressed illegally at a constant rhythm, the next press timing can be predicted based on the previous start switch press. According to the second embodiment of the present invention, it is possible to disable a game by cheating by performing a separation operation at the next press timing, and even when it is erroneously determined that a normal player presses the start switch is cheating. The possibility of hindering the progress of the subsequent game can be reduced. The start switch can be pressed by breaking a certain rhythm, and such an operation is not particularly inconvenient for a normal player.

  A specific operation of the timing prediction unit 9 will be described. Regarding the timing prediction operation, for example, there are methods shown in the following (A) and (B).

(A) When the same and similar random number values are continuously extracted, the timing is predicted by applying the pressing timing (time interval) of the start switch from which they are extracted to the next pressing of the start switch. First and second timings are set before and after the predicted next start switch pressing timing (for example, a timing of −10% is a first timing and a timing of + 10% is a second timing).

  The timing prediction unit 9 stores an operation time for the start switch 30 by the player, and predicts an operation for the start switch 30 by the player based on the stored operation time interval.

  A description will be added with reference to FIG. Assume that the start switch 30 is pressed at times t (−2), t (−1), and t (0), and random values of r (−2), r (−1), and r (0) are extracted. These random values r (−2), r (−1), and r (0) are the same or similar, and it is determined that the random number monitor 7 is fraudulent, and the timing switch 9 next presses the start switch 30. It is assumed that the timing t (1) is predicted (it is assumed that when the same or similar random number value is extracted three times in succession, it is determined to be fraudulent, but this is only an example, for example, 5 It may be determined to be fraudulent when consecutive times are applied.

The timing prediction unit 9 stores operation times t (−2), t (−1), and t (0) for the start switch 30. By obtaining these differences, the pressing interval of the start switch 30 can be obtained. If it is a fraudulent act, the interval between t (-2) and t (-1) and the interval between t (-1) and t (0) are both TS. The interval between t (0) and t (1) should be the same. Therefore, the next press timing of the start switch 30 is predicted as follows.
t (1) = t (0) + TS
(It may be t (1) = t (−1) + 2TS or t (1) = t (−2) + 3TS)

The timing at which the separation operation is performed by the separation mechanism 30a is t (1). Considering the operation time of the separation mechanism 30a, the separation mechanism 30a is driven slightly before that, and after t (1), some separation is performed. It is preferable to keep the mechanism 30a driven. For example, the separation operation is performed with a width of +/− 10% of TS.
First timing = t (0) + 0.9TS
Second timing = t (0) + 1.1TS

  As described above, the timing prediction unit 9 predicts the operation timing of the start switch 30 by the player, and determines the first timing for enabling the separation mechanism 30a and the second timing for disabling based on the prediction result. .

In addition, you may make it add a separation operation repeatedly. For example, the separation operation is applied N times (N is a natural number) continuously or intermittently based on the following equation.
t (1) = t (0) + nTS (n = 1, 2, 3,..., N)

(B) When the same and similar random numbers are successively extracted, the next generation timing of the random number generator is predicted to be the next start switch pressing timing. First and second timings are set before and after the predicted next start switch pressing timing (for example, a timing of −10% is a first timing and a timing of + 10% is a second timing).

  The timing prediction unit 9 stores the random number generation repetition timing of the random number generator 3, and predicts the player's operation on the start switch 30 based on the stored random number generation repetition timing.

  A description will be added with reference to FIG. Assume that the start switch 30 is pressed at times t (−2), t (−1), and t (0), and random values of r (−2), r (−1), and r (0) are extracted. These random values r (−2), r (−1), and r (0) are the same or similar, and it is determined that the random number monitor 7 is fraudulent, and the timing switch 9 next presses the start switch 30. Assume that the timing t (1) is predicted.

  The timing prediction unit 9 stores the random number generation repetition timing of the random number generator 3. That is, the random number generation repetition period T and the timing at which a predetermined random number value can be obtained (for example, the latest time tr at which 0000 is obtained) are stored. Based on these, the next press timing of the start switch 30 is predicted as follows.

Since the random number generator 3 increments the count value at regular intervals, the timing for generating the random value r (0) is (r (0) / R) with the count value of the random number generator 3 = 0000 as a reference. T. However, R is the number of random numbers that the random number generator 3 can take (65536 if 16 bits). Since the time when the count value = 0000 of the random number generator 3 is tr, the next pressing timing of the start switch 30 is as follows.
t (1) = tr + (r (0) / R) T
(It may be based on t (-1) or t (-2))

For the same reason as (A), it is preferable to keep the separation mechanism 30a effective before and after t (1). For example, the separation operation is performed with a width of +/− 10% of TS.
First timing = tr + 0.9 (r (0) / R) T
Second timing = tr + 1.1 (r (0) / R) T

In addition, you may make it add a separation operation repeatedly like (A).
According to the above processing, the separation operation is applied to the repetition cycle of the random number generator 3, and illegal acts can be reliably prevented. Note that the interval at which the start switch 30 is actually pressed in the case of fraudulent action is TS (TS> T), and it is not necessary to perform a separation operation for each repetition period, and it is sufficient to perform it intermittently.

  As described above, the timing prediction unit 9 predicts the operation timing of the start switch 30 by the player, and determines the first timing for enabling the separation mechanism 30a and the second timing for disabling based on the prediction result. .

  According to the second embodiment of the present invention, it is impossible to perform an illegal act of continuously acquiring the same random number using a so-called solenoid got, and even when the normal player's game is erroneously determined to be an illegal act, the start switch The game can be played if the timing of pressing is slightly shifted, and it is possible to prevent the player from proceeding as much as possible.

  The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say.

  In the present specification, means / units do not necessarily mean physical means, but also include cases where the functions of each means / unit are realized by software. Further, the function of one means / unit may be realized by two or more physical means, or the function of two or more means / parts may be realized by one physical means.

It is a front view of a gaming machine (slot machine). 1 is a block diagram of a gaming machine according to an embodiment of the invention. It is a block diagram of the winning lottery means and fraud detector of the gaming machine according to the first embodiment of the invention. It is explanatory drawing of the start switch which concerns on embodiment of invention (separation mechanism non-operation). It is explanatory drawing of the start switch which concerns on embodiment of invention (separation mechanism action | operation). It is a flowchart of the internal lottery process (a separation operation process is included) which concerns on Embodiment 1 of invention. It is explanatory drawing of determination of whether the same or approximated random value is extracted in embodiment of invention. It is explanatory drawing of the other determination whether the random number value which is the same or approximated in embodiment of invention is extracted. It is a block diagram of the winning lottery means and fraud detection unit of the gaming machine according to the second embodiment of the invention. It is a flowchart of the internal lottery process (a separation operation process is included) which concerns on Embodiment 2 of invention. It is explanatory drawing (timing chart) of the timing prediction operation | movement which concerns on Embodiment 2 of invention. It is explanatory drawing (timing chart) of the other timing prediction operation | movement which concerns on Embodiment 2 of invention. It is a timing chart for demonstrating the operation | movement of the conventional random value acquisition.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Winning lottery means 1b Fraud detection part 3 Random number generator 4 Random number extractor 5 Judgment part 6 Winning judgment table 7 Random value monitor 8 Separation mechanism drive part 9 Timing prediction part 30 Start switch 30a Separation mechanism 30a-1 Solenoid 30a- 2 bar 30a-3 shielding member 134a spherical knob 134b lever (operation shaft)
134c sensor 134d fulcrum

Claims (8)

In a gaming machine having a winning lottery means for performing a lottery based on a signal from a start switch and performing a winning determination based on the result of the lottery,
The start switch is provided on the front surface of the gaming machine, receives an operation of the player at one end, and moves between a predetermined reference position and a swing position separated from the operation shaft; A sensor that is provided at the other end of the operation shaft and detects whether the operation shaft is at the reference position; and a separation mechanism that separates the sensor from the other end of the operation shaft;
The winning lottery means includes a random number generator for generating a random number for lottery, a random number extractor for extracting a random number generated by the random number generator based on a signal of the start switch, and a correspondence between a random value related to the lottery and the winning A winning determination table that stores the relationship in advance, and a determination unit that determines whether or not the random number extracted by the random number extractor has been won with reference to the winning determination table;
Comparing the random number value extracted by the random number extractor with a previously extracted random value, and detecting that the same or approximate random number value is extracted based on the comparison result; and
A gaming machine comprising: a separation mechanism driving unit that drives the separation mechanism when it is detected by the random number monitor that the same or similar random number values are extracted. A timing prediction unit that predicts a timing of an operation on the operation axis by a player and determines a first timing for enabling the separation mechanism and a second timing for disabling the separation mechanism based on a prediction result;
The gaming machine according to claim 1, wherein the separation mechanism driving unit enables the separation mechanism only between the first timing and the second timing by the prediction unit.   The gaming machine according to claim 2, wherein the timing predicting unit obtains a time interval of an operation on the operation axis by the player, and predicts an operation timing on the operation axis by the player based on the time interval. .   The timing prediction unit stores the random value extracted by the random number extractor, and the random number generator calculates the random value based on a range of random numbers generated by the random number generator and a predetermined repetition period. The gaming machine according to claim 2, wherein an output timing is obtained and an operation timing of the operation axis by the player is predicted based on the timing.   The random number monitor continuously monitors the extracted random value, and the state where the difference between the previously extracted random value and the current random value is zero or smaller than a predetermined threshold value, The game according to any one of claims 1 to 4, wherein it is determined that the same or approximate random number value is extracted when a predetermined number of times or a predetermined frequency is exceeded. Machine.   The random number monitor continuously monitors the extracted random value, and a state in which a difference between a predetermined reference value and the random number value becomes zero or becomes smaller than a predetermined threshold value is determined in advance. The gaming machine according to any one of claims 1 to 4, wherein when the number of occurrences exceeds a predetermined frequency or a predetermined frequency, it is determined that the same or approximate random number value is extracted. A gaming machine that performs a lottery based on a signal from a start switch and makes a winning determination based on a result of the lottery, wherein a sensor that detects on / off of the start switch is disabled by separating the sensor from the start switch. A method for preventing fraud in a gaming machine equipped with a mechanism,
Generating random numbers for lottery;
Extracting the generated random number based on the signal of the start switch;
A step of determining whether or not the extracted random number value has been won with reference to a winning determination table that stores in advance a correspondence relationship between the random value related to the lottery and winning;
Comparing the extracted random value with a previously extracted random value;
When it is determined that the same or approximate random number value is extracted based on the obtained comparison result, predicting the operation timing for the operation axis by the player;
Determining a first timing for enabling the separation mechanism and a second timing for disabling the separation mechanism based on the predicted operation timing;
Enabling the separation mechanism at the first timing and disabling the separation mechanism at the second timing. A gaming machine that performs a lottery based on a signal from a start switch and makes a winning determination based on a result of the lottery, wherein a sensor that detects on / off of the start switch is disabled by separating the sensor from the start switch. A program for causing a computer to execute a method for preventing fraud in a gaming machine having a mechanism,
Generating random numbers for lottery;
Extracting the generated random number based on the signal of the start switch;
A step of determining whether or not the extracted random number value has been won with reference to a winning determination table that stores in advance a correspondence relationship between the random value related to the lottery and winning;
Comparing the extracted random value with a previously extracted random value;
When it is determined that the same or approximate random number value is extracted based on the obtained comparison result, predicting the operation timing for the operation axis by the player;
Determining a first timing for enabling the separation mechanism and a second timing for disabling the separation mechanism based on the predicted operation timing;
Enabling the separation mechanism at the first timing and disabling the separation mechanism at the second timing.

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