Roulette remains the most famous casino game. People with her help won fortunes. Often many lost. In the world are dozens variations of roulettes. Let's get acquainted with the main. History appearance Classic roulette made in France. There many theories about her appearance. Consider most popular: 1. Development roulettes attributed to scientist Blaise Pascal. It is believed that entertainment is the outcome of experiments to develop a perpetual motion machine. 2. There is a theory about the creation of roulette as an extension to the older Italian game of biribi. French changed part of the rules, added spinning wheel. Over time the game changed, people created norms. According to the results the roulette acquired a modern type. However the milestones of its development went through difficult periods. In most cases in Old World game played in hotels. Opinion of monarchies about gambling was negative. Periodically the roulette wheel was closed. State of things changed with the help of the Principality of Monaco. Charles III allowed casinos to operate. As a result roulette gained necessary popularity. Technology facilitated movement, this increased the spread of roulette. Began appearing new variations: • European; • American; • Turkish and others. Each species has own additions. But general rules stable. General norms games Wheel divided into elements. Each segment possesses personal numbering. Dealer spins projectile in opposite vector from movement of wheel. After some time it will stop on some element. This will determine the winner. Number fields varies. Classic roulette divided into 37 elements. The American presents 38 sectors. Add double zero. People can make different variations of bets: 1. Per number. 2. On a series of numbers. 3. Odd or Even. 4. Black or red. Winning depends by amount bet and kind of made dispute. For example approximately same outcomes multiplier x2. Casino doubles the player's bet. Will it win The situation with the roulette is ambiguous. Many people often announce fabulous winnings. But things are not so clear. Analyze the most popular scheme of doubling. The essence of the method is simple. Player must match any bet with multiplier x2. Let's assume, take red or black. After must bet on one result and wait end game. If you win the person takes the money. After required make bet on the starting amount. In case of loss have to double bet. Bet should on the same result. Desired outcome sooner or later will come, player will pay back losses and earn. Prize amount equals to the initial bet. Method seems flawless. But the scheme has many obvious disadvantages: 1. Chance of the required sector less than 50%. Black and red fields diluted with zero. In an infinite set of bets the mathematical expectation is negative. It means that the profit from the scheme goes to only the establishment. 2. Players don't consider variance. Hit desired field may not happen 20-30 games in a row. As a result person lose funds. Double up long won't work. Player will lose money faster. 3. Often in calculations an inaccuracy is observed. Let's imagine a situation with tossing a coin. Hit reverse and obverse – equally probable events. Many players believe that having an obverse in the starting game probability of having a reverse on the second roll multiplies 2. Thus it becomes 75%. In reality this point of view is wrong. Rounds not connected to each other. That is, a loss an losing result reaches the mark of 50%. However roulette win is still real. Recommend refuse strategies. Bet should for your own joy. According to the results player be able to get a good plus.