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In some cases multiple machines are linked across multiple casinos. Il est aussi possible de faire des plic-plac-ploc: Forgot Username or Password? They "sought to show that these "losses disguised as wins" LDWs would be as arousing as wins, and more arousing than regular losses". Optimal play is a payback percentage based on a gambler using the optimal strategy in a skill-based slot machine game.
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The play will iterate among Backgammon, Gul Bara, and Tapa until one of the players reaches a score of 7 or 5. Coan ki is an ancient Chinese board game that is very similar. Plakoto , Fevga and Portes are three versions of backgammon played in Greece. Together, the three are referred to as Tavli. Other minor variants to the standard game are common among casual players in certain regions. For instance, only allowing a maximum of five checkers on any point Britain  or disallowing "hit-and-run" in your home board Middle East.
Backgammon has an established opening theory , although it is less detailed than that of chess. The tree of positions expands rapidly because of the number of possible dice rolls and the moves available on each turn. Recent computer analysis has offered more insight on opening plays, but the midgame is reached quickly.
After the opening, backgammon players frequently rely on some established general strategies, combining and switching among them to adapt to the changing conditions of a game.
The number rolled with the highest probability is six see picture. Strategies can derive from that. The most direct one is simply to avoid being hit, trapped, or held in a stand-off. A "running game" describes a strategy of moving as quickly as possible around the board, and is most successful when a player is already ahead in the race.
As the game progresses, this player may gain an advantage by hitting an opponent's blot from the anchor, or by rolling large doubles that allow the checkers to escape into a running game. The "priming game" involves building a wall of checkers, called a prime, covering a number of consecutive points. This obstructs opposing checkers that are behind the prime. A checker trapped behind a six-point prime cannot escape until the prime is broken. Because the opponent has difficulty re-entering from the bar or escaping, a player can quickly gain a running advantage and win the game, often with a gammon.
A "backgame" is a strategy that involves holding two or more anchors in an opponent's home board while being substantially behind in the race. The backgame is generally used only to salvage a game wherein a player is already significantly behind. Using a backgame as an initial strategy is usually unsuccessful. For example, players may position all of their blots in such a way that the opponent must roll a 2 in order to hit any of them, reducing the probability of being hit more than once.
Many positions require a measurement of a player's standing in the race, for example, in making a doubling cube decision, or in determining whether to run home and begin bearing off. The minimum total of pips needed to move a player's checkers around and off the board is called the "pip count". The difference between the two players' pip counts is frequently used as a measure of the leader's racing advantage. Players often use mental calculation techniques to determine pip counts in live play.
Backgammon is played in two principal variations, "Money" and "Match" play. Money play means that every point counts evenly and every game stands alone, whether money is actually being wagered or not. The format has a significant effect on strategy. In a match, the objective is not to win the maximum possible number of points, but rather to simply reach the score needed to win the match. For example, a player leading a 9-point match by a score of 7—5 would be very reluctant to turn the doubling cube, as their opponent could take and make a costless redouble to 4, placing the entire outcome of the match on the current game.
In money play, the theoretically correct checker play and cube action would never vary based on the score. In , Emmet Keeler and Joel Spencer considered the question of when to double or accept a double using an idealized version of backgammon. In their idealized version, the probability of winning varies randomly over time by Brownian motion , and there are no gammons or backgammons.
To reduce the possibility of cheating, most good quality backgammon sets use precision dice and a dice cup. Online cheating has therefore become extremely difficult. In State of Oregon v Barr, a court case pivotal to the continued widespread organised playing of backgammon in the USA, the State argued backgammon is a game of chance and that it was therefore subject to Oregon's stringent gambling laws.
Paul Magriel was a key witness for the defence, contradicting Dr. Roger Nelson, the expert prosecution witness, by saying, "Game theory, however, really applies to games with imperfect knowledge, where something is concealed, such as poker. Backgammon is not such a game. Everything is in front of you. The person who uses that information in the most effective manner will win. After the closing arguments, Judge Stephen S. Walker concluded that backgammon is a game of skill, not a game of chance, and found the defendant, backgammon tournament director Ted Barr, not guilty of promoting gambling.
Enthusiasts have formed clubs for social play of backgammon. A backgammon chouette permits three or more players to participate in a single game, often for money. One player competes against a team of all the other participants, and positions rotate after each game.
Chouette play often permits the use of multiple doubling cubes. Backgammon clubs may also organize tournaments. Large club tournaments sometimes draw competitors from other regions, with final matches viewed by hundreds of spectators. Winners at major tournaments may receive prizes of tens of thousands of dollars. Starting in January , tournament directors began awarding GammonPoints,  a free points registry for tournament directors and players, with GammonPoint awards based on the number of players and strength of field.
The first world championship competition in backgammon was held in Las Vegas , Nevada in Tim Holland was declared the winner that year and at the tournament the following year. For unknown reasons, there was no championship in , but in , Tim Holland again won the title. In , Lewis Deyong, who had promoted the Bahamas World Championship for the prior three years, suggested that the two events be combined.
By the 21st century, the largest international tournaments had established the basis of a tour for top professional players. Major tournaments are held yearly worldwide. PartyGaming sponsored the first World Series of Backgammon in from Cannes and later the 'Backgammon Million' tournament held in the Bahamas in January with a prize pool of one million dollars, the largest for any tournament to date.
The event was recorded for television in Europe airing on Eurosport. In , the WBA collaborated with the online backgammon provider Play65 for the season of the European Backgammon Tour and with "Betfair" in At the 43rd World Backgammon Championship in Monte Carlo,  former radio talk show host Larry Shiller began color-commenting matches as the Voice of Backgammon,  with archived videos on Twitch  and YouTube. When backgammon is played for money , the most common arrangement is to assign a monetary value to each point, and to play to a certain score, or until either player chooses to stop.
The stakes are raised by gammons, backgammons, and use of the doubling cube. Backgammon is sometimes available in casinos. Before the commercialization of artificial neural network programs, proposition bets on specific positions were very common among backgammon players and gamblers.
Backgammon software has been developed not only to play and analyze games, but also to facilitate play between humans over the internet. Dice rolls are provided by random or pseudorandom number generators. Real-time online play began with the First Internet Backgammon Server in July ,   but there are now a range of options;  many of which are commercial.
Backgammon has been studied considerably by computer scientists. Neural networks and other approaches have offered significant advances to software for gameplay and analysis. The first strong computer opponent was BKG 9. Early versions of BKG played badly even against poor players, but Berliner noticed that its critical mistakes were always at transitional phases in the game.
He applied principles of fuzzy logic to improve its play between phases, and by July , BKG 9. It won the match, 7—1, becoming the first computer program to defeat a world champion in any board game. Berliner stated that the victory was largely a matter of luck, as the computer received more favorable dice rolls.
In the late s, backgammon programmers found more success with an approach based on artificial neural networks. Its neural network was trained using temporal difference learning applied to data generated from self-play.
Tesauro proposed using rollout analysis to compare the performance of computer algorithms against human players. The rollout score of the human or the computer is the difference of the average game results by following the selected move versus following the best move, then averaged for the entire set of taken moves.
The strength of these programs lies in their neural networks' weights tables, which are the result of months of training. Without them, these programs play no better than a human novice. For the bearoff phase, backgammon software usually relies on a database containing precomputed equities for all possible bearoff positions.
Computer-versus-computer competitions are also held at Computer Olympiad events. The Royal Game of Ur , originating in ancient Mesopotamia before BC, may be an ancestor of modern-day table games like backgammon. It used tetrahedral dice. In the modern Arab Levant and Iraq the game is called tawle which means table, and it is also called shesh besh shesh means 6 in Aramaic and Phoenician , but derives from Phoenician.
Backgammon is one of the oldest games in existence. The artifacts included two dice and 60 checkers, and the set is believed to be to years older than the Royal Game of Ur. On the board found in Shahr-e Sukhteh the fields are fashioned by the coils of a snake.
Touraj Daryaee —on the subject of the first written mention of early precursors of backgammon—writes:. The use of dice for the game is another indication of its Indic origin, since dice and gambling were a favorite pastime in ancient India.
According to the historical legend, the Indian king Dewisarm sends his minister Taxritos to Persia with the game of chess , and a letter challenging Sasanian King Khosrow I to solve the riddle or rationale for the game. The prizes are usually small, but they are paid in addition to other winnings.
The scatter symbol is usually a special symbol, which means the wild symbol cannot replace it, although in some games the wild symbol also substitutes for scatters.
Slot variance is a measure of risk associated with playing a slot machine. A low variance slot machine has regular but smaller wins and a high variance slot machine has fewer but bigger wins. Taste is a reference to the small amount often paid out to keep a player seated and continuously betting.
Only rarely will machines fail to pay out even the minimum placed a bet over the course of several pulls. Tilt Electromechanical slot machines usually include an electromechanical " tilt switch ", which makes or breaks a circuit if the machine is tilted or otherwise tampered with, and so triggers an alarm. While modern machines no longer have tilt switches, any kind of technical fault door switch in the wrong state, reel motor failure, out of paper, etc.
Theoretical Hold Worksheet A document provided by the manufacturer for all slot machines, which indicates the theoretical percentage that the slot machine should hold based on the amount paid in.
The worksheet also indicates the reel strip settings, number of coins that may be played, the payout schedule, the number of reels and other information descriptive of the particular type of slot machine. Weight count is an American term, referring to the dollar amount of coins or tokens removed from a slot machine's drop bucket or drop box and counted by the casino's hard count team through the use of a weigh scale. Wild Symbol Wild symbols act like joker cards in a slot game.
Basically, they substitute for all other symbols in the game, usually except for other special symbols, such as scatter and jackpot. They can appear on any of the reels. However, this is not mandatory and can be changed from game to game. In some games, wild symbols can appear only on certain reels. Or, they can appear only during the bonus rounds. The player must refer to the rules and paytable of the game to learn about the landing rules.
Mobile is when the slot machine is hosted for online gambling and it is usually available for use on a phone, tablet, or other portable device. These are often standalone mobile casino applications but are also found as part of the online casino site.
By , HTML5 technology and the advancement of mobile browsers had negated the need for standalone mobile apps. New slots are, by majority, playable on both mobile and desktop devices.
Each machine has a table that lists the number of credits the player will receive if the symbols listed on the pay table line up on the pay line of the machine. Some symbols are wild and can represent many, or all, of the other symbols to complete a winning line. Especially on older machines, the pay table is listed on the face of the machine, usually above and below the area containing the wheels.
Most video machines display the pay table when the player presses a "pay table" button or touches "pay table" on the screen; some have the pay table listed on the cabinet as well. Historically, all slot machines used revolving mechanical reels to display and determine results. Although the original slot machine used five reels, simpler, and therefore more reliable, three reel machines quickly became the standard.
This limited the manufacturer's ability to offer large jackpots since even the rarest event had a likelihood of 0. Although the number of symbols eventually increased to about 22, allowing 10, combinations,  this still limited jackpot sizes as well as the number of possible outcomes.
In the s, however, slot machine manufacturers incorporated electronics into their products and programmed them to weight particular symbols. Thus the odds of losing symbols appearing on the payline became disproportionate to their actual frequency on the physical reel.
A symbol would only appear once on the reel displayed to the player, but could, in fact, occupy several stops on the multiple reel. With microprocessors now ubiquitous, the computers inside modern slot machines allow manufacturers to assign a different probability to every symbol on every reel.
To the player it might appear that a winning symbol was 'so close', whereas in fact the probability is much lower. In the s in the UK machines embodying microprocessors became common. These used a number of features to ensure the payout was controlled within the limits of the gambling legislation. As the coin was inserted into the machine it could go one of two routes, either direct into the cashbox for the benefit of the owner, or alternatively it would go into a channel that formed the payout reservoir, the microprocessor monitoring the number of coins in this channel.
The drums themselves were driven by stepper motors, controlled by the processor and with proximity sensors monitoring the position of the drums. A "look up table" within the software allows the processor to know what symbols were being displayed on the drums to the gambler.
This allowed the system to control the level of payout by stopping the drums at positions it had determined. If the payout channel had filled up, the payout became more generous, if nearly empty, less so thus giving good control of the odds. The video slot machine is a more recent innovation, with no moving parts at all — instead a graphical representation of one appears on screen. In addition, because there are no mechanical constraints on the design of video slot machines, most display five reels rather than three.
This greatly expands the number of possibilities: As there are so many combinations given by five reels, the manufacturers do not need to weight the payout symbols although some may still do so.
Instead, higher paying symbols will typically appear only once or twice on each reel, while more common symbols, earning a more frequent payout, will appear many times. Video slot machines typically encourage the player to play multiple "lines", so rather than simply taking the middle of the three symbols displayed on each reel, a line could go from top left to bottom right, or any of the other patterns specified by the manufacturer.
As each symbol is equally likely, there is no difficulty for the manufacturer in allowing the player to take any or all of the possible lines on offer — the long-term return to player will be the same. The difference for the player is that the more lines he plays the more likely he is to get paid on a given spin — though of course he is betting more in the first place. To avoid the feeling that the player's money is simply ebbing away whereas a payout of credits on a single line machine would be bets, and the player would feel they had made a substantial win, on a 20 line machine, it would only be 5 bets and would not seem significant , manufacturers commonly offer bonus games, which can return many times their bet.
The player is encouraged to keep playing to reach the bonus: All modern machines are designed using pseudo random number generators "PRNGs" , which are constantly generating a sequence of simulated random numbers, at a rate of hundreds or perhaps thousands per second. As soon as the "Play" button is pressed, the most recent random number is used to determine the result.
This means that the result varies depending on exactly when the game is played. A fraction of a second earlier or later, and the result would be different. It is important that the machine contains a high-quality RNG implementation, because all PRNGs must eventually repeat their number sequence,  and if the period is short, or the PRNG is otherwise flawed, an advanced player may be able to 'predict' the next result.
Having access to the PRNG code and seed values, Ronald Dale Harris , a former slot machine programmer, discovered equations for specific gambling games like Keno that allowed him to predict what the next set of selected numbers would be based on the previous games played. Most machines are designed to defeat this by generating numbers even when the machine is not being played, so the player cannot tell where in the sequence they are, even if they know how the machine was programmed.
This is known as the "theoretical payout percentage" or RTP, "return to player". The minimum theoretical payout percentage varies among jurisdictions and is typically established by law or regulation. The winning patterns on slot machines — the amounts they pay and the frequencies of those payouts — are carefully selected to yield a certain fraction of the money played to the "house" the operator of the slot machine , while returning the rest to the players during play.
Within some EGM development organizations this concept is referred to simply as "par. A slot machine's theoretical payout percentage is set at the factory when the software is written. Changing the payout percentage after a slot machine has been placed on the gaming floor requires a physical swap of the software or firmware , which is usually stored on an EPROM but may be loaded onto non-volatile random access memory NVRAM or even stored on CD-ROM or DVD , depending on the capabilities of the machine and the applicable regulations.
Based on current technology, this is a time-consuming process and as such is done infrequently. Other jurisdictions, including Nevada, randomly audit slot machines to ensure that they contain only approved software. Historically, many casinos, both online and offline, have been unwilling to publish individual game RTP figures, making it impossible for the player to know whether they are playing a "loose" or a "tight" game.
Since the turn of the century some information regarding these figures has started to come into the public domain either through various casinos releasing them—primarily this applies to online casinos—or through studies by independent gambling authorities.
The return to player is not the only statistic that is of interest. The probabilities of every payout on the pay table is also critical. For example, consider a hypothetical slot machine with a dozen different values on the pay table. However, the probabilities of getting all the payouts are zero except the largest one.
Also, most people would not win anything, and having entries on the paytable that have a return of zero would be deceptive. As these individual probabilities are closely guarded secrets, it is possible that the advertised machines with high return to player simply increase the probabilities of these jackpots.
The added advantage is that these large jackpots increase the excitement of the other players. This game, in its original form, is obsolete, so these specific probabilities do not apply. He only published the odds after a fan of his sent him some information provided on a slot machine that was posted on a machine in the Netherlands. The psychology of the machine design is quickly revealed.
There are 13 possible payouts ranging from 1: Most players assume the likelihood increases proportionate to the payout. The one midsize payout that is designed to give the player a thrill is the It is programmed to occur an average of once every plays.
In contrast the The highest payout of 2, The player who continues to feed the machine is likely to have several midsize payouts, but unlikely to have a large payout. He quits after he is bored or has exhausted his bankroll. Despite the fact that they are confidential, occasionally a PAR sheet is posted on a website. They have limited value to the player, because usually a machine will have 8 to 12 different possible programs with varying payouts.
In addition, slight variations of each machine e. The casino operator can choose which EPROM chip to install in any particular machine to select the payout desired. The result is that there is not really such a thing as a high payback type of machine, since every machine potentially has multiple settings. Without revealing the proprietary information, he developed a program that would allow him to determine with usually less than a dozen plays on each machine which EPROM chip was installed.
Then he did a survey of over machines in 70 different casinos in Las Vegas. He averaged the data, and assigned an average payback percentage to the machines in each casino. The resultant list was widely publicized for marketing purposes especially by the Palms casino which had the top ranking. One reason that the slot machine is so profitable to a casino is that the player must play the high house edge and high payout wagers along with the low house edge and low payout wagers.
Other bets have a higher house edge, but the player is rewarded with a bigger win up to thirty times in craps. The player can choose what kind of wager he wants to make. A slot machine does not afford such an opportunity.
Theoretically, the operator could make these probabilities available, or allow the player to choose which one so that the player is free to make a choice. However, no operator has ever enacted this strategy. Different machines have different maximum payouts, but without knowing the odds of getting the jackpot, there is no rational way to differentiate. In many markets where central monitoring and control systems are used to link machines for auditing and security purposes, usually in wide area networks of multiple venues and thousands of machines, player return must usually be changed from a central computer rather than at each machine.
A range of percentages is set in the game software and selected remotely. In , the Nevada Gaming Commission began working with Las Vegas casinos on technology that would allow the casino's management to change the game, the odds, and the payouts remotely.
The change cannot be done instantaneously, but only after the selected machine has been idle for at least four minutes. After the change is made, the machine must be locked to new players for four minutes and display an on-screen message informing potential players that a change is being made. Often machines are linked together in a way that allows a group of machines to offer a particularly large prize, or "jackpot".
Each slot machine in the group contributes a small amount to this progressive jackpot , awarded to a player who gets, for example, a royal flush on a video poker machine or a specific combination of symbols on a regular or nine-line slot machine. The amount paid for the progressive jackpot is usually far higher than any single slot machine could pay on its own.
In some cases multiple machines are linked across multiple casinos. In these cases, the machines may be owned by the manufacturer, who is responsible for paying the jackpot. The casinos lease the machines rather than owning them outright. Casinos in New Jersey, Nevada, and South Dakota now offer multi-state progressive jackpots, which now offer bigger jackpot pools. Mechanical slot machines and their coin acceptors were sometimes susceptible to cheating devices and other scams.
One historical example involved spinning a coin with a short length of plastic wire. The weight and size of the coin would be accepted by the machine and credits would be granted. However, the spin created by the plastic wire would cause the coin to exit through the reject chute into the payout tray.
This particular scam has become obsolete due to improvements in newer slot machines. Another obsolete method of defeating slot machines was to use a light source to confuse the optical sensor used to count coins during payout. Modern slot machines are controlled by EPROM computer chips and, in large casinos, coin acceptors have become obsolete in favor of bill acceptors.
These machines and their bill acceptors are designed with advanced anti-cheating and anti-counterfeiting measures and are difficult to defraud. Early computerized slot machines were sometimes defrauded through the use of cheating devices, such as the "slider" or "monkey paw".
Computerized slot machines are fully deterministic and thus outcomes can be sometimes successfully predicted. Malfunctioning electronic slot machines are capable of indicating jackpot winnings far in excess of those advertised. In the United States, the public and private availability of slot machines is highly regulated by state governments. Many states have established gaming control boards to regulate the possession and use of slot machines.
Nevada is the only state that has no significant restrictions against slot machines both for public and private use. In New Jersey , slot machines are only allowed in hotel casinos operated in Atlantic City. Several states Illinois , Indiana , Louisiana and Missouri allow slot machines as well as any casino-style gambling only on licensed riverboats or permanently anchored barges.
Since Hurricane Katrina , Mississippi has removed the requirement that casinos on the Gulf Coast operate on barges and now allows them on land along the shoreline. Delaware allows slot machines at three horse tracks; they are regulated by the state lottery commission. In Wisconsin, bars and taverns are allowed to have up to five machines. These machines usually allow a player to either take a payout, or gamble it on a double-or-nothing "side game".
A player redeems his winnings by pressing a button to print a ticket, which the bartender redeems for cash. The territory of Puerto Rico places significant restrictions on slot machine ownership, but the law is widely flouted and slot machines are common in bars and coffeeshops.
Conversely, in Connecticut , Hawaii , Nebraska , South Carolina , and Tennessee , private ownership of any slot machine is completely prohibited. The remaining states allow slot machines of a certain age typically 25—30 years or slot machines manufactured before a specific date.
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