JP2007307262A - Game machine, game-machine fraudulent-act preventing method and its program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fraudulent-act preventing method for sensing and preventing a fraudulent act by a so-called bodily sensation which provides a normal game player with no disadvantage. <P>SOLUTION: A main board implementing a lottery referring to a game is provided with a waiting-time memory part for previously storing a waiting time from a reception of the game to capability of receiving a next specified switch signal. A random number value extracted by a lottery random number extractor is compared with that extracted before the value. When continuous extraction of the same value or a value approximate to this is detected, the game is made hard to continue by the waiting time stored in the memory part being elongated. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a gaming machine such as a slot machine, a fraud prevention method for a gaming machine, 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 (hereinafter simply referred to as “gaming machine”) is provided with a medal slot so that a player can enjoy a game by inserting a predetermined number of medals. The medals necessary for the game can be borrowed with 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 the predetermined conditions, 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. The possibility that the player can skillfully operate the start switch using any device to increase the lottery probability beyond a predetermined value cannot be denied. For example, a low-frequency treatment device (hereinafter referred to as “sensory device”) is attached to the arm, and the timing of pressing the start switch is adjusted by periodically stimulating the muscles of the arm, and similar random values are repeatedly acquired. It was thought that. Since the repetition period of the random number generator (counter) is constant (T), the same random number value can be obtained in principle by setting the push switch depression period TS to an integral multiple of T. It seems that cheating is performed by adjusting the period of stimulation by the sensory sensor. 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.

  As techniques for making it difficult to predict random numbers to be acquired in the lottery, there are the following techniques.

Japanese Patent Application No. 11-290504 gazette It is intended to prevent fraudulent acts in which a fraudulent person attaches a fraudulent machine to a slot machine or a pachinko machine. In the case of a slot machine, the microcomputer reads data to be verified based on a signal from a start switch or the like and compares it with reference data for a predetermined bonus game to determine whether they match. However, the read timing at that time is shifted with irregularity. For example, a random number is generated between the switch and the CPU in order to prevent fraudulent installation of a machine that turns on at a certain time. Even if you take a random and illegal machine, you won't get a bonus game every time.

  In addition to the above-mentioned prior art, as mentioned above, when it is judged that the start switch is operated illegally with the help of the machine, an error is generated and a penalty is imposed (for example, the bonus cannot be won). There were some that were detrimental to the player and thus tried to deter cheating.

  According to the above-mentioned countermeasures against fraud, although the above-mentioned fraudulent acts can be suppressed, there is a risk that when a normal player's act is mistakenly determined to be fraudulent, the player may be disadvantaged. . Conventional countermeasures against illicit sensory cheating may involve ordinary customers.

  An object of the present invention is to provide a gaming machine, a gaming machine fraud prevention method, and a program that do not give a disadvantage to a normal player.

The present invention relates to a gaming machine including a main board that performs a lottery process relating to a game, wherein the main board includes:
A standby time storage unit that stores in advance a standby time from when a signal of a predetermined switch is received until the next predetermined switch signal can be received;
A random number generator for generating random numbers for lottery, a random number extractor for extracting random numbers generated by the random number generator based on a signal of the predetermined switch, and a win determination in which a correspondence between a random value related to lottery and winning is stored in advance A determination unit that determines whether or not the random value extracted by the random number extractor is won by referring to the table, the winning determination table, and the random value extracted by the random number extractor is extracted before the random value A random value monitor that detects that the same or similar random value is extracted based on the comparison result, and the same or approximate random value is extracted by the random value monitor And a winning lottery means including a standby time extension unit for extending the standby time stored in the standby time storage unit when it is detected.

The present invention provides a winning lottery means for performing a lottery based on a signal from a predetermined switch and performing a winning determination based on a result of the lottery, a medal selector for selecting and discharging inserted medals, and the medal selector. A first sensor and a second sensor for detecting the inserted medals, and counting the number of medals inserted based on outputs of the first sensor and the second sensor, and the first sensor In a gaming machine comprising a control unit that compares the output of the sensor and the second sensor with a predetermined criterion and generates an error based on the comparison result.
A criterion storage unit that stores the criterion,
Another determination criterion storage unit that stores other determination criteria different from the determination criteria;
A switching unit that selects either the determination criterion or the other determination criterion and outputs the selected criterion to the control unit;
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 switch, and a correspondence relationship between a random value for the lottery and winning Are stored in advance, a determination unit that determines whether or not the random number extracted by the random number extractor is won with reference to the winning determination table, and the random number extracted by the random number extractor A random value monitor that compares a random value extracted before the random value and detects that the same or similar random value is extracted based on the comparison result;
The switching unit selects the other determination criterion when the random number monitor detects that the same or approximate random number value is extracted.
The control unit may automatically cancel the generated error after a predetermined time has elapsed.
The random number monitor, for example, compares the previous random number value with the current random number value, and when they match or when the difference is smaller than a predetermined threshold, the same or approximate random number value is extracted. It is determined that The previous random number value is typically the immediately preceding random value. When the random number sequence is expressed by r (0), r (1),..., When the current random value is r (N) (N is an integer), the random value r (N−1) is This is the previous random value. In addition, the random number values r (N−1), (r (N−2)),... The random number value 10 times before (r (N−10)) should be the previous random number value. Can do. However, since the effect of preventing fraud is not achieved even when compared with a random number value before 100 games, for example, the previous time means a random number value about 10 times before.
The random number monitor continuously monitors the extracted random value, for example, and 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 to have occurred more than a predetermined number of times, it is determined that the same or similar random number values have been extracted.
The random number monitor continuously monitors the extracted random value, for example, and the state where the difference between the predetermined reference value and the random value becomes zero or becomes smaller than a predetermined threshold value, When the number of occurrences exceeds a predetermined number, it is determined that the same or approximate random number value is extracted.

The error is a backflow error meaning that the first sensor and the second sensor did not detect medals in a predetermined order;
The second sensor is disposed downstream of the first sensor;
The determination criterion is a pattern in which medals are detected in the order of the second sensor and the first sensor, and thereafter medals are not detected in the order of the second sensor and the first sensor.
In addition to the pattern in which the other determination criterion is to detect medals in the order of the second sensor and the first sensor, and thereafter the medal is not detected in the order of the second sensor and the first sensor, A pattern including detecting a medal again by the second sensor after detecting the medal in the order of the first sensor and the second sensor;
The controller may generate the backflow error when it is determined that the outputs of the first sensor and the second sensor match the determination criterion or the other determination criterion.

The error is a dwell error that means that the time during which the first sensor or the second sensor detects a medal exceeds a predetermined threshold,
The determination criterion is a predetermined detection time by the first sensor or the second sensor or a threshold longer than that,
The other criterion is a threshold shorter than the threshold stored in the criterion.
The control unit may generate the stay error when a detection time of the first sensor and the second sensor exceeds a threshold value of the determination criterion or the other determination criterion.

The present invention is a method for preventing fraud in a gaming machine that performs a lottery based on a signal from a predetermined switch and performs a win determination based on a result of the lottery,
Extracting the generated random number for lottery based on the signal of the switch;
Determining whether or not the extracted random number value has been won with reference to a winning determination table in which the correspondence between the random value related to the lottery and the winning is stored in advance;
Comparing the extracted random value with a random value extracted before the random value, and detecting that the same or similar random value is extracted based on the comparison result;
When it is detected that the same or an approximate random number value is extracted, the waiting time stored in advance until the next predetermined switch signal can be received after the predetermined switch signal is received is extended. And a step.

The present invention provides a winning lottery means for performing a lottery based on a signal from a predetermined switch and performing a winning determination based on a result of the lottery, a medal selector for selecting and discharging inserted medals, and the medal selector. A method for preventing fraud in a gaming machine comprising a first sensor and a second sensor for detecting medals inserted and inserted,
Extracting the generated random number for lottery based on the signal of the switch;
Determining whether or not the extracted random number value has been won with reference to a winning determination table in which the correspondence between the random value related to the lottery and the winning is stored in advance;
Counting the number of medals inserted based on the outputs of the first sensor and the second sensor;
Comparing the outputs of the first sensor and the second sensor with a predetermined criterion, and generating an error based on the comparison result;
Comparing the extracted random value with a random value extracted before the random value, and detecting that the same or similar random value is extracted based on the comparison result;
A step of changing the predetermined criterion to another criterion when detecting that the same or approximate random number value is extracted.

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.

  According to the present invention, when an illegal act is detected by the random number monitor, the time interval in which the game can be continuously received is extended, or an error in the medal selector (this error is automatically recovered). By making it easy to generate, it is possible to slow down the execution of the game of the fraudster, and it is possible to obstruct the cheating and make it difficult to perform the cheating. According to the present invention, the game process itself does not become difficult to win a bonus as usual, so that there is little disadvantage to a normal player.

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 gaming 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 gaming machine 10.

  The gaming 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 that are continuously inserted into the medal insertion slot 100 and stored 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 rotary reel 40 includes a rotary drum made of synthetic resin and a tape-like reel tape 42 attached around the rotary drum. A plurality of (for example, 21) symbols 61 are displayed on the outer peripheral surface of the reel tape 42. Reference numeral 62 denotes a liquid crystal display unit for performing various effects.

  Inside the gaming machine 10, as will be described later, a main board 1 (see FIG. 2), which is a control device for controlling the overall operation of the gaming machine 10, is incorporated. The control device is configured around a CPU and includes a ROM, a RAM, an I / O, and the like. The CPU (processing unit) is operated by reading a program stored in a ROM (storage unit) in response to the player's operation. Specifically, the CPU (processing unit) is operated by 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 elapses 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.

  FIG. 2 is a block diagram showing an electrical schematic structure of the gaming machine 10. In this figure, the display about the power supply system is omitted. The gaming machine 10 includes a main substrate 1 as a first processing unit and a sub substrate 2 as a second processing unit that operates in response to a command from the main processing device as its main processing device.

  When the main board 1 controls the rotation and stop of the rotary reel 40 based on the operation of the start switch 30 and the stop switch 50, it is determined whether or not a winning qualification is obtained based on a predetermined internal lottery probability. Including a winning lottery means 1a-1 for performing a lottery for. 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.

  The winning lottery means 1 a-1 is provided on the main board 1. The main board 1 further has a waiting time from when a signal of a predetermined switch relating to a game is received until the signal of the next predetermined switch can be received (the next game is not accepted unless the waiting time has elapsed). Is stored in advance.

  At least the main substrate 1 is accommodated inside the case so that it cannot be contacted from the outside, and a sealing process is performed so that traces remain when the substrates are removed.

  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 in accordance with 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 the driving by the hopper driving unit 80 when the medal count value actually paid out 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 the game processing procedure executed by the gaming 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 the areas corresponding to the random number generated from the random number generator, and the selected random number 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 an out-of-range category (region) in 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.

  As described above, the ROM of the main board 1 stores a program, a winning probability table, a symbol table, a winning symbol combination table, and the like, which are collectively referred to as being stored in the ROM. This is called ROM data. Alternatively, they may be collectively referred to as program data in terms of a program for causing the CPU to perform an operation for control processing and data related thereto.

  FIG. 3 is a block diagram of the winning lottery means according to the first embodiment of the invention. At least some of the functions of the winning lottery means (for example, the determination unit 5, the winning determination table 6, the random number monitor 7a, and the waiting time extension unit 7b) are executed by the same CPU as the program stored in the ROM of the main board 1. Or by hardware such as an IC. As shown in FIG. 3, the winning lottery means includes a random number generator 3, a random number extractor 4, a determination unit 5, and a winning determination table 6.

  The gaming machine according to the embodiment of the invention further stores a random number value extracted last time, and compares the stored previous random number value with the random number value extracted by the random number extractor 4. And a standby time extension unit 7b for extending the standby time based on the comparison result. Although not shown, the random number monitor 7a includes a random value storage unit (semiconductor memory (RAM) or the like) for storing the previously extracted random value. The random value monitor 7a compares the random value extracted by the random number extractor 4 with a random value extracted before this random value, and the same or similar random value is extracted based on the comparison result. (Specifically, when the random number extracted this time coincides with the previous random value or when the difference between them is smaller than a predetermined threshold value). The standby time extension unit 7b extends the standby time when it is detected by the random number monitor that the same or similar random number values are extracted (for example, the contents of the standby time storage unit 1a-2). (Rewrite to something meaning a longer time, or replace the output of the standby time storage unit 1a-2 with a standby time stored in advance or calculated in accordance with a predetermined rule).

The main board 1 receives a signal from the start switch 30 and receives a next game again only after a game is started and a predetermined waiting time has elapsed. Specifically, the stop switch 50 of the next game is not effective until after the waiting time has elapsed, and the rotation of the reel cannot be stopped. This is to prevent the next game from being accepted until the completion of the internal processing of the gaming machine (especially the winning determination process) (if the game is repeatedly received at extremely short intervals, the operation of the internal processing may become unstable. Absent). It also has a meaning of limiting the number of games that a player can execute in a certain time. The standby time is determined in advance (for example, 4.1 seconds), and the standby time is stored in advance in the standby time storage unit 1a-2.
The waiting time, that is, the time interval at which a game can be continuously received, is specifically the minimum time interval at which a game can be started (a random number is extracted) by pressing the start switch 30. When it is shorter than this interval, even if a predetermined switch (start switch 30, stop switch 50, etc.) is operated, the signal is ignored. The embodiment of the present invention imposes a penalty that the game takes time by widening the time interval. However, from the viewpoint of preventing fraud, the time interval is the start switch. It is not limited to the interval from when the switch 30 is pressed until the stop switch 50 is activated, but the time interval related to other switches operated by the player, for example, when the start switch 30 is pressed and the start switch 30 is pressed again. It may be a time interval until it becomes valid, a time interval until a plurality of stop switches 50 can be operated continuously (a time interval until the second stop operation becomes possible after the first stop operation), or the like. In short, the standby time is the time from when a predetermined switch operation signal is received until the next predetermined switch operation signal can be received.

  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 a random number generated by the random number generator 3 at the timing of a predetermined switch operation (for example, operation 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 an out-of-range category (region) in 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 value monitor 7a compares the previous random value with the random value extracted by the random number extractor 4, and the waiting time extension unit 7b changes the waiting time according to the comparison result of the random value monitor 7a. . For example, the random value monitor 7a extracts random values that are the same or approximate when the random number extracted by the random number extractor 4 matches the previous random number or when the difference between them is smaller than a predetermined threshold. It is determined that In response to this, the standby time extension unit 7b extends the standby time (longer than the value of the standby time storage unit 1a-2). Thereby, execution of a cheating person's game can be delayed and it can be made difficult to do cheating.
Note that the determination performed by the random number monitor 7a as to whether or not an improper act using a so-called sensor is performed is performed by comparing the newly extracted random number value with the previous random number value. It is appropriate to compare with the previous random number when judging fraud, because the fraudulent act is a qualification for winning continuously (that is, obtaining the same or similar random value that can obtain the qualification). is there. Typically, the random value r (N−1) immediately before, that is, when the newly extracted random number value is r (N) (N is an integer) is the “previous” random number value. It is not limited to this. For example, r (N-10) is also a “previous” random value. However, for example, even if compared with a random number value before 100 games, there is no effect of preventing fraud. In the present specification, “previous” means the previous (r (N−1)), the last time (r (N−2)),... About 10 times before (r (N−10)). Shall mean.

  In order to determine whether or not to extend the waiting time, there is a method of taking a history of a certain period such as 10 games for a random value acquired by the player and determining whether or not it can occur statistically. For example, it is statistically impossible to extract almost the same random number value for 10 games in a row. Although it is not continuous, the same random number value is extracted in 8 games. It is the same that almost the same random number value is extracted continuously in five games.

  Extraction of random numbers by the start switch 30 is an independent event in mathematics, and the probability distribution of random values is uniform (the random number extraction probability of any of 0000 to FFFF is the same). Therefore, general statistical theory can be applied. For example, if the number of games is N, the expected random number extracted from these is E (N) (equivalent to 8000 (hexadecimal) if 16 bits). When the difference (deviation) between the average value AV of the random values actually obtained and the expected value E (N) is larger than a threshold value (for example, one of the standard deviations σ, 2σ, or 3σ), it is statistically impossible. Can be determined.

Specific methods for extending the waiting time include the following methods (1) to (3). Details will be described later.
(1) Simply compare the previous random number value with the current random number value and extend the waiting time when they match or when the difference between them is smaller than a predetermined threshold.
(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 given number of times, the waiting time is extended.
(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 happens, extend the waiting time.

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

FIG. 4 is a process flowchart of the gaming machine according to the first embodiment of the invention.
When the start switch 30 is pressed, the process of FIG. 4 is executed. That is, a random number is acquired (S1), and a check is performed by comparing the acquired random number with a history of extracted random number values stored for a certain period (S2). It is determined whether or not the random number history is statistically abnormal (S3). The specific method is as described above or below. If it is not statistically abnormal (NO in S3), the process returns to the normal process without performing any special process. If statistically abnormal (YES in S3), the 4.1 second wait, that is, the standby time is further increased (S4). Then, the process returns to normal processing.
When the statistical abnormal state is resolved, the standby time may be restored.

  The criteria for determining whether or not statistically abnormal will be described. The embodiment of the present invention is for preventing an illegal act of continuously obtaining a desired random value by moving a hand or an arm at a constant cycle using a sensory sensor. 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, it is statistically determined to be abnormal.
(Current random value)-(Previous random value) = 0
Or (current random value)-(previous random value) <(threshold)
When the above condition is satisfied, it is statistically determined to be abnormal.
For example, the random number monitor 7a calculates the left side of the above formula and outputs the result. Then, on the receiver side, the received value is compared with the threshold value, and when (received value) <(threshold value), it is statistically determined to be abnormal. The determination of (received value) <(threshold) may be performed by the random number monitor 7a.
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 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. When the number of occurrences exceeds the specified number, it is statistically determined as abnormal.
This method will be described with reference to FIG.
FIG. 5A 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. 5B is a graph in which the random number difference (vertical axis) is plotted in time series.
(Random number difference) = (Current random number value)-(Previous random value)
It is.
In FIG. 5B, the vertical axis indicates threshold values Th + and Th−.

  For example, the random number monitor 7a calculates the left side of the above formula and outputs the result. On the receiver side, the received value is compared with the threshold value, and when the difference is continuously included in the threshold value Th + and Th− within a certain number of times (for example, five times or more), it is statistically abnormal. judge. In FIG. 5B, 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, Is judged abnormal. Note that the random number monitor 7a may determine whether or not the difference is continuously included in the range between the threshold values Th + and Th− more than a certain number of times.

  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), it is not statistically determined to be abnormal 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 value by the fraudulent person becomes the same or similar value continuously (part (p) to (t) in FIG. 5), particularly when the fraudulent act is succeeding. In such a case, it may be determined statistically abnormal. In view of the nature of the random value by such a fraudster, the detection probability can be increased by increasing the threshold Th in FIG. 5B (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 FIG. 5 (b), when (p) to (t) are continuously within the threshold value, that is, 5 times continuously, it is statistically determined to be abnormal, but this is an example and not 5 times. 10 times, 20 times, and so on.

  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, it is statistically determined to be abnormal.
This method will be described with reference to FIG.
FIG. 6A 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. 6B 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 Embodiment 1 of the present invention, when cheating is detected by the random number monitor, the execution time of the cheating game can be delayed by extending the time interval at which the game can be continuously received. , Can make it harder to cheat. According to the present invention, the game process itself does not become difficult to win a bonus as usual, so there is usually little disadvantage to the player.

Embodiment 2 of the Invention
In the first embodiment of the invention, the random number value acquired by the player is recorded for a certain period of time, such as 10 games, and it is determined by the main program whether it can occur statistically. If it is determined that there is an abnormality, By making the 4.1 second wait (standby time) even longer, "it made it harder to cheat. Instead, a minor error (an error that automatically recovers) may be generated. Among the preferred minor errors are the medal selector E1 error and E6 error. The E1 error is a backflow error indicating that the medal has moved in the reverse direction for some reason. The E6 error is a dwell error indicating that the flow of medals is delayed for some reason or that medals are temporarily clogged.

  FIG. 7 is a functional block diagram of the gaming machine according to the second embodiment of the invention. In FIG. 7, the same or corresponding parts as those in FIG. 2 are denoted by the same reference numerals, and description thereof is omitted.

The MS is a medal selector that selects and ejects inserted medals.
S1 and S2 are a first sensor and a second sensor that are provided in the medal selector MS and detect medals inserted.

  Reference numeral 1b denotes a medal counting control unit (control unit) that counts the number of medals inserted based on the output S2 of the first sensor S1 and the second sensor. The medal counting control unit 1b compares the outputs of the first sensor S1 and the second sensor S2 with a determination criterion or other determination criterion stored in advance in the determination criterion storage unit 1d or another determination criterion storage unit 1e. The error E1 or E6 is generated based on the comparison result. Which judgment criterion is used is selected by the switching unit 1c. The error E1 or E6 is automatically restored when a predetermined time has elapsed. Specifically, the CPU of the main board 1 measures time or receives a signal from the timer, and resets the error flag.

  The configuration of the winning lottery means 1a that performs lottery based on the signal from the start switch 30 and determines the winning based on the result of the lottery is that the output of the random number monitor 7a is sent to the switching unit 1c. Except for this, it is the same as FIG.

  The random value monitor 7a compares the random value extracted by the random number extractor 4 with a random value extracted before the random value, and the same or approximate random value is extracted based on the comparison result. Is detected. The switching unit 1c determines the error criterion used by the medal counting control unit 1b when the random number monitor 7a detects that the same or approximate random number value is extracted as a standard criterion. It switches from what was memorize | stored in the memory | storage part 1d to what was memorize | stored in the other criteria storage part 1e which is a stricter criterion.

  FIG. 8 is a perspective view of a medal selector provided in the gaming machine. FIG. 9 is an operation explanatory diagram of the medal selector of FIG. 8 and 9A, MS is a medal selector, MS1 is a downwardly inclined medal passage, MS2 is a medal outlet of the medal selector 1, S1 and S2 are a first sensor and a second sensor provided in the medal passage 11. Sensor. These sensors are, for example, photo interrupters. The second sensor S2 is provided on the downstream side of the first sensor S1. M indicates the inserted medal. The medal M inserted from the upper part of the medal selector MS falls along the medal passage MS1, the direction of travel is changed to a slant sideways, and is discharged from the medal outlet MS2. Note that irregular medals of different sizes fall in the middle of the medal passage and return to the medal return slot.

  In the vicinity of the medal exit MS2, two medal sensors S1 and S2 are provided side by side along the medal traveling direction. The detection of medals is performed according to the detection order of the two sensors. FIG. 9B shows a timing chart of output signals of the sensors S1 and S2 when the medal M passes. In the signal of FIG. 9B, a high level is positive logic indicating a medal passing state. The phase of the signal of the sensor S1 provided on the front side is more advanced than that of S2. The passage of medals sent without being blocked on the way is detected by the sensors S1, S2. Since S1 and S2 are provided adjacent to each other, it is possible to detect the passing speed and passing direction of medals, and based on these, not only the number of medals but also illegal acts using medals backflow or celluloid are detected. can do. Further, by providing the medal sensors S1 and S2 on the side far from the medal entrance, it is difficult to cheat.

FIG. 10 is a process flowchart of the gaming machine according to the second embodiment of the invention.
When the start switch 30 is pressed, the processing of FIG. 10 is executed. That is, a random number is acquired (S1), and a check is performed by comparing the acquired random number with a history of extracted random number values stored for a certain period (S2). It is determined whether or not the random number history is statistically abnormal (S3). The specific method is as described above. If it is not statistically abnormal (NO in S3), the process returns to the normal process without performing any special process. If statistically abnormal (YES in S3), the determination criteria are switched to make it easier to generate a medal selector error (S5). Then, the process returns to normal processing.
If the statistical abnormal state is resolved, the determination criterion may be restored.

  As a criterion for switching in S5, a reverse flow error (E1) indicating that the above-mentioned medal has moved in the reverse direction for some reason, and that the flow of the medal is delayed for some reason or that the medal is temporarily jammed. There is a retention error (E6). A description will be added about these.

(E1: Backflow error)
The backflow error indicates that, for example, when medals are continuously inserted, one of the medals has moved in the reverse direction because of a collision with a preceding medal. When the medal normally passes the sensor part, as shown in FIG. 9B, the medal is detected in the order of a and c, and the medal is not detected in the order of b and d (however, a Is detection of medals by the first sensor, b is detection loss of medals by the first sensor, c is detection of medals by the second sensor, and d is detection loss of medals by the second sensor).

  On the other hand, when the medal moves in the reverse direction at the sensor portion, as shown in FIG. 9C, the medal is detected in the order of c and a, and the medal is not detected in the order of d and b. The criterion stored in the criterion storage unit 1d is a pattern in which medals are detected in the order of a and c, and medals are not detected in the order of b and d.

  Other determination criteria stored in the other determination criterion storage unit 1e include, in addition to the above determination criteria, after detecting medals in the order of the first sensor S1 and the second sensor S2 (this detection order is normal). And a pattern (symbols a to e) for detecting the medal again by the second sensor S1. This added pattern is shown in FIG. This pattern means that a medal that has passed normally returns slightly for some reason and returns to the position of the second sensor S2, but does not return to the position of the first sensor S1. Therefore, according to the other determination criteria, an error occurs even when the medal moves slightly in the reverse direction. Other criteria can be said to be stricter than “normal” criteria.

(E6: Residence error)
The retention error means that the time during which the first sensor S1 or the second sensor S2 is detecting a medal exceeds a predetermined threshold.
The determination criterion stored in the determination criterion storage unit 1d is a standard detection time Ts by the first sensor S1 or the second sensor S2 (the detection time Ts continues at a high level in the timing chart of FIG. 9). Corresponds to the time).
On the other hand, the criterion stored in the other criterion storage unit 1e is a detection time Te shorter than the standard detection time Ts (Ts> Te).
The medal counting control unit 1b generates a retention error when the outputs of the first sensor S1 and the second sensor S2 exceed the standard detection time Ts or the threshold Te stored in the other determination reference storage unit 1e. generate. Since the other criterion is determined to be an error in a shorter time, it can be said that it is stricter than the “normal” criterion.

  As described above, cheating is prevented by giving a slight obstacle to the game, such as “to easily cause an E1 or E6 error”. Don't dare to “unplayable” or “invalidate winning results” so that customers who play normally may accidentally get caught.

  According to the second embodiment of the present invention, when a cheating is detected by a random number monitor, it is possible to delay the execution of the cheating game by facilitating an error in the medal selector. Can be made difficult. Since the above error is automatically restored, there is little disadvantage to the normal player.

  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.

  Further, in this specification, “unit” does not necessarily mean a physical means, but includes a case where the function of each “unit” is realized by software. Further, the function of one “part” may be realized by two or more physical means, or the function of two or more “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 of the gaming machine according to the first embodiment of the invention. It is a processing flowchart of the gaming machine according to the first embodiment of the 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 of the gaming machine according to the second embodiment of the invention. It is a perspective view of a medal selector. It is explanatory drawing of the error determination which concerns on Embodiment 2 of invention. It is a process flowchart of the game machine which concerns on Embodiment 2 of invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main board | substrate 1a-1 Winning lottery means 1a-2 Standby time memory | storage part 1b Medal counting control part 1c Switching part 1d Judgment standard memory | storage part 1e Other judgment standard memory | storage parts 2 Sub board | substrate 3 Random number generator 4 Random number generator (Random number generation) The random number generator and the random number generator)
5 Judgment Unit 6 Winning Judgment Table 7a Random Number Monitor 7b Standby Time Extension Unit 10 Slot Machine 11 Housing 12 Display Window 13 Symbol Display Window 16 Bet Switch 17 Checkout Switch 30 Start Switch 40 Rotating Reel 42 Reel Tape 50 Stop Switch 60 Reel Unit 61 Symbol 62 Liquid crystal display unit 70 Reel drive unit 71 Reel position detection circuit 80 Hopper drive unit 81 Hopper 82 Medal detection unit 100 Medal insertion slot 200 Liquid crystal control board 201 Speaker 202 LED board 304 Medal payout slot 311 Medal receiving part (lower plate) )
MS medal selector MS1 medal passage MS2 medal exit S1 first sensor S2 second sensor

Claims (9)

In a gaming machine including a main board that performs a lottery process related to a game, the main board includes:
A standby time storage unit that stores in advance a standby time from when a signal of a predetermined switch is received until the next predetermined switch signal can be received;
A random number generator for generating random numbers for lottery, a random number extractor for extracting random numbers generated by the random number generator based on a signal of the predetermined switch, and a win determination in which a correspondence between a random value related to lottery and winning is stored in advance A determination unit that determines whether or not the random value extracted by the random number extractor is won by referring to the table, the winning determination table, and the random value extracted by the random number extractor is extracted before the random value A random value monitor that detects that the same or similar random value is extracted based on the comparison result, and the same or approximate random value is extracted by the random value monitor And a winning lottery means including a waiting time extension unit for extending the waiting time stored in the waiting time storage unit when it is detected. A lottery is performed based on a signal from a predetermined switch, and a winning lottery means for determining a winning based on a result of the lottery, a medal selector for selecting and discharging the inserted medals, and the medal selector being inserted. A first sensor for detecting a medal and a second sensor, and counting the number of medals inserted based on the outputs of the first sensor and the second sensor, and the first sensor and the second sensor In a gaming machine comprising a control unit that compares the output of the sensor 2 with a predetermined criterion and generates an error based on the comparison result.
A criterion storage unit that stores the criterion,
Another determination criterion storage unit that stores other determination criteria different from the determination criteria;
A switching unit that selects either the determination criterion or the other determination criterion and outputs the selected criterion to the control unit;
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 switch, and a correspondence relationship between a random value for the lottery and winning Are stored in advance, a determination unit that determines whether or not the random number extracted by the random number extractor is won with reference to the winning determination table, and the random number extracted by the random number extractor A random value monitor that compares a random value extracted before the random value and detects that the same or similar random value is extracted based on the comparison result;
The switching unit selects the other determination criterion when it is detected that the same or approximate random number value is extracted by the random number monitor.   The gaming machine according to claim 2, wherein the control unit automatically cancels the generated error after a predetermined time has elapsed. The error is a backflow error meaning that the first sensor and the second sensor did not detect medals in a predetermined order;
The second sensor is disposed downstream of the first sensor;
The determination criterion is a pattern in which medals are detected in the order of the second sensor and the first sensor, and thereafter medals are not detected in the order of the second sensor and the first sensor.
In addition to the pattern in which the other determination criterion is to detect medals in the order of the second sensor and the first sensor, and thereafter the medal is not detected in the order of the second sensor and the first sensor, A pattern including detecting a medal again by the second sensor after detecting the medal in the order of the first sensor and the second sensor;
The said control part generates the said backflow error, when it judges that the output of a said 1st sensor and a said 2nd sensor is suitable for the said criterion or the said other criterion. Game machines. The error is a dwell error that means that the time during which the first sensor or the second sensor detects a medal exceeds a predetermined threshold,
The determination criterion is a predetermined detection time by the first sensor or the second sensor or a threshold longer than that,
The other criterion is a threshold shorter than the threshold stored in the criterion.
The control unit generates the dwell error when a detection time of the first sensor and the second sensor exceeds a threshold value of the determination criterion or the other determination criterion. The gaming machine described. A method of preventing fraud in a gaming machine in which a lottery is performed based on a signal from a predetermined switch and a winning determination is made based on a result of the lottery,
Extracting the generated random number for lottery based on the signal of the switch;
Determining whether or not the extracted random number value has been won with reference to a winning determination table in which the correspondence between the random value related to the lottery and the winning is stored in advance;
Comparing the extracted random value with a random value extracted before the random value, and detecting that the same or similar random value is extracted based on the comparison result;
A game machine comprising: a step of extending a pre-stored standby time corresponding to a time interval in which a signal of the predetermined switch can be continuously received when it is detected that the same or approximate random number value is extracted. Fraud prevention method. A lottery is performed based on a signal from a predetermined switch, and a winning lottery means for determining a winning based on a result of the lottery, a medal selector for selecting and discharging the inserted medals, and the medal selector being inserted. A gaming machine comprising a first sensor and a second sensor for detecting a medal,
Extracting the generated random number for lottery based on the signal of the switch;
Determining whether or not the extracted random number value has been won with reference to a winning determination table in which the correspondence between the random value related to the lottery and the winning is stored in advance;
Counting the number of medals inserted based on the outputs of the first sensor and the second sensor;
Comparing the outputs of the first sensor and the second sensor with a predetermined criterion, and generating an error based on the comparison result;
Comparing the extracted random value with a random value extracted before the random value, and detecting that the same or similar random value is extracted based on the comparison result;
A fraud prevention method for a gaming machine comprising: a step of changing the predetermined criterion to another criterion when it is detected that the same or approximate random number is extracted. A program for causing a computer to perform a fraud prevention method in a gaming machine that performs a lottery based on a signal from a predetermined switch and performs a win determination based on a result of the lottery,
Extracting the generated random number for lottery based on the signal of the switch;
Determining whether or not the extracted random number value has been won with reference to a winning determination table in which the correspondence between the random value related to the lottery and the winning is stored in advance;
Comparing the extracted random value with a random value extracted before the random value, and detecting that the same or similar random value is extracted based on the comparison result;
When it is detected that the same or an approximate random number value is extracted, the waiting time stored in advance until the next predetermined switch signal can be received after the predetermined switch signal is received is extended. And a program for executing the step. A lottery is performed based on a signal from a predetermined switch, and a winning lottery means for determining a winning based on a result of the lottery, a medal selector for selecting and discharging the inserted medals, and the medal selector being inserted. A program for causing a computer to execute a fraud prevention method in a gaming machine comprising a first sensor and a second sensor for detecting a medal,
Extracting the generated random number for lottery based on the signal of the switch;
Determining whether or not the extracted random number value has been won with reference to a winning determination table in which the correspondence between the random value related to the lottery and the winning is stored in advance;
Counting the number of medals inserted based on the outputs of the first sensor and the second sensor;
Comparing the outputs of the first sensor and the second sensor with a predetermined criterion, and generating an error based on the comparison result;
Comparing the extracted random value with a random value extracted before the random value, and detecting that the same or similar random value is extracted based on the comparison result;
A program for executing the step of changing the predetermined criterion to another criterion when it is detected that the same or approximate random number is extracted.

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