Roulette is the most famous casino game. People with her help won a lot of money. Often many lost. In the world there several variations of roulettes. Learn about the most important. History creation Classic roulette invented French. There several opinions about her appearance. Introduce most popular: 1. Development roulettes gifted to mathematician Blaise Pascal. It is believed that entertainment is the result of experiments to create a perpetual motion machine. 2. There is a version about the creation of roulette as an addition to the ancient Italian game of biribi. French changed part of the rules, added spinning wheel. Gradually the game changed, players created rules. According to the results the roulette received a modern look. But the milestones of its development went through difficult periods. In most cases in Europe roulette placed in inns. Opinion of authorities about gambling was negative. Periodically the roulette wheel was prohibited. Things changed thanks to of the Principality of Monaco. Local monarch legalized the gambling industry. As a result roulette gained necessary fame. Technology facilitated travel, this increased the prevalence of roulette. Started appearing new variations: • European; • American; • Turkish and others. Each species has own additions. But general norms stable. Basic norms roulette Wheel divided into sectors. Each segment possesses its own numbering. Croupier launches ball in opposite direction from spinning of roulette. Over time it will stop any element. This will determine the winner. Number sectors differentiated. Classic roulette divided into 37 elements. The American presents 38 fields. Add double zero. People can make different variations of bets: 1. Per number. 2. On a series of numbers. 3. Even or Odd. 4. Black or red. Winning depends by amount bet and type of made dispute. For example approximately equally probable outcomes multiplier x2. Establishment 2xes the player's bet. Will it win The situation with the roulette is ambiguous. Players often announce colossal prize. But things are not so clear. Analyze the most known 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 need make bet on the initial amount. In case of loss must double bet. Play should on the same result. Desired outcome sooner or later will come, person will pay back losses and become a plus. Prize amount equals to the first bet. Method seems ideal. However the tactic exists many expressed disadvantages: 1. Probability of the required sector less 50%. Black and red fields diluted with zero. In an infinite set of bets the mathematical expectation is negative. It means that the income from the tactic goes to only the casino. 2. People don't consider variance. Hit required field may not happen 20-30 games in a row. As a result user will lose money. Double up infinitely won't work. Person will lose funds faster. 3. Often during calculations an error is made. Let's imagine a situation with tossing a coin. Hit reverse and obverse – events with the same probability. 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 undesired outcome reaches the mark of 50%. However roulette win is still real. Recommend refuse strategies. Play should for your own joy. According to the results player be able to get a good plus.