While the roulette ball has no memory, mathematicians have continually devised complex betting systems.

These systems are designed to manage bankrolls and potentially recover losses during a session.
The Most Famous Roulette System
The Martingale is undoubtedly the most famous and widely used betting strategy in the world.

When you finally win, you recoup your losses and secure a profit equal to your original wager.
Simple to understand and executeDangerous during extended losing streaksGuarantees small profits if you don't bust The Fibonacci Sequence Strategy
This strategy is considered safer and less aggressive than the steep progressions of the Martingale.

Because the bet sizes increase slower, it is easier on your bankroll during a losing streak.
The Flat Progression System
Conversely, you decrease your wager by one single unit following a winning spin.

This approach assumes that over time, wins and losses will balance out almost equally.
SystemBankroll NeededComplexityD'AlembertLowVery SimpleLabouchereMediumComplex
Remember that no betting system can alter the fundamental mathematics or the casino's house edge.