Roulette is the most famous casino game. People with her help won fortunes. Often many fixed losses. In the world there several variations of roulettes. Learn about the most important. History creation Traditional roulette invented in France. There several theories about her appearance. Consider most popular: 1. Creation roulettes attributed to scientist Blaise Pascal. Historians believe that entertainment become the outcome of experiments to create a perpetual motion machine. 2. There is a version about the origin of roulette as an extension to the ancient Italian game of biribi. French changed part of the rules, added spinning wheel. Over time the game changed, people created norms. As a result the roulette acquired a modern look. But the stages of its development went through difficult times. Most often in Old World game played in hotels. Opinion of authorities about gambling remained negative. With a fair amount of consistency the roulette wheel was prohibited. State of things changed thanks to of the Principality of Monaco. Charles III legalized the gambling industry. According to the results roulette gained necessary fame. Technical progress simplified travel, this increased the spread of roulette. Started appearing new variations: • European; • American; • Turkish and others. Each species has own additions. But all norms stable. General norms roulette Playing field divided into sectors. Each segment possesses personal numbering. Croupier spins projectile in opposite direction from movement of wheel. Over time it will stop the movement on some field. This will determine the prize. Number sectors varies. Regular roulette divided into 37 elements. The American presents 38 fields. Add double zero. Players can make various types of bets: 1. Per number. 2. On a series of numbers. 3. Even or Odd. 4. Red or black. Potential Profit determined by amount bet and kind of concluded dispute. For example approximately same outcomes multiplier x2. Establishment 2xes the player's bet. Will it win The situation with the roulette is difficult. Many people often announce fabulous winnings. But things are not so clear. Analyze the most known tactics of doubling. The principle of the model is simple. Person must match any bet with multiplier x2. Let's assume, use black or red. After must bet on certain 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 have to double bet. Bet should on the same result. Desired outcome sooner or later will come, person return losses and earn. Win is to the initial bet. Model seems ideal. However the tactic has many expressed minuses: 1. Chance of the desired event less than 50%. Red and black sectors diluted with 0. In an infinite number of bets the mathematical expectation is will be negative. It means that the profit from the tactic goes to only the casino. 2. People don't consider variance. Hit required sector may not happen 20-30 rounds in a row. As a result person lose funds. Double up infinitely impossible. Person will lose money faster. 3. Often during calculations an inaccuracy is observed. Let's give an example with tossing a coin. Hit reverse and obverse – events with the same probability. People often believe that having an obverse in the starting game chances of having a reverse on the second roll doubles. That is it becomes 75%. In reality this opinion is wrong. Throws not combined with each other. That is, a loss an undesired outcome reaches the mark of 50%. However roulette win is still possible. Recommend refuse strategies. Play should for fun. As a result person can get high profits.