Leonardo Pisano, more commonly known as Fibonacci was a famous mathematician from the Middle Ages. This inventor devised the system (amongst others) how to predict how fast rabbits multiply. Through the use of this invention, the Fibonacci System has been implemented into the roulette world. This is why the Fibonacci System is less aggressive than the Martingale System; you do not need to double your bet here every time that you lose. On a series of losses, it will take longer to earn your losses. Even so, this theory uses the line of Fibonacci, and thus the numerical series: 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, and so on. Each number in this series is always the sum of the two, preceding numbers.
How does the Fibonacci roulette System work?
When the Fibonacci series is used in roulette bets, you simply have to follow the Fibonacci numbers in order to determine how much you need to bet. These bets are placed on outside bets, such as red or black bets. Losing your bet means proceeding with your betting amount or uniting in accordance with the Fibonacci series. This means writing down the sequence while you go along. Winning on the first bet means starting the series over again, but if you have lost a few times, you simply get rid of the last number.

Example
Bet 1 unit and lose = 1. Bet 1 and lose 1 = 1, 1. Bet 2 and lose = 1, 1, 2. Bet 3 and lose = 1, 1 , 2, 3. Bet 5 and win = 1, 1, 2, 3. Bet 2 and lose = 1, 1, 2. Bet 3 and win = 1, 1, 2. Bet 1 and win = 1.
Does Fibonacci really work?
Just because the Fibonacci series is a working model for the growth of a rabbit population does not imply that this system has magic powers over the roulette wheel, unfortunately. The house still has a mathematical advantage which means you need to have luck on your side to make this work. Then again, the Fibonacci System can improve your odds, because your win back your losses quite well. This entails that you follow the series and that it can take a while before you win, meaning that you need quite some patience for this system.