Roulette Betting Systems Explained

A roulette betting system is a structured method for deciding how much to stake in each round. Systems operate on stake sizing or sequencing, not on the wheel. The outcome of every spin is random and independent of all previous results. No betting system changes that, alters the house edge, or improves the probability of any outcome.

This page explains how each of the main roulette betting systems works mechanically: the structure of each system, when stakes change, and what the reset conditions are. There are no recommendations and no performance claims. 

A betting system is a pre-defined rule for adjusting stakes across successive rounds. Instead of placing the same amount on every spin, a player using a system increases or decreases their stake based on a specific condition, typically a win, a loss, or a position in a sequence.

Players use systems for different reasons. Some use them to give sessions a defined structure. Others use them to manage how stakes are distributed across a session. The common thread is that all systems operate within the same mathematical framework: fixed payout ratios, a fixed number of pockets, and outcomes that are independent of each other.

What every system on this page has in common

Positive progression systems increase the stake after each win, according to each system's defined rule. Stakes return to the base level after a loss or after reaching the system's defined limit. All four systems below operate on this principle.

Paroli betting system

The Paroli system increases the stake after each win up to a fixed number of consecutive wins, typically three. After the third consecutive win, the stake resets to the base regardless of the result. A loss at any point also resets the stake to base. 

Paroli 

• Category: Positive progression 
• Mechanic: Increase stake by doubling after each win, for up to three consecutive wins. 
• Reset condition: After three consecutive wins, or after any loss, return to base stake. 

Sequence example using a 1-unit base stake: 1 (win) > 2 (win) > 4 (win) > reset to 1. A loss at any stage in that sequence also resets to 1.

Reverse Martingale betting system

The Reverse Martingale doubles the stake after each win. Unlike the Paroli, there is no fixed number of consecutive wins at which the stake automatically resets. The stake resets to the base amount only after a loss.

Reverse Martingale 

• Category: Positive progression 
• Mechanic: Double stake after each win. 
• Reset condition: Return to base stake after any loss.

Contra D'Alembert betting system

The Contra D'Alembert (also called the Reverse D'Alembert) increases the stake by one unit after a win and decreases it by one unit after a loss. It is the structural opposite of the D'Alembert system described later in this page.

Contra D'Alembert 

• Category: Positive progression
• Mechanic: Increase stake by one unit after a win. Decrease stake by one unit after a loss. 
• Reset condition: Stake does not return to base automatically. Adjustments continue unit by unit based on results. 

Reverse Labouchere betting system

The Reverse Labouchere uses a number sequence. The stake for each round is the sum of the first and last numbers in the sequence. After a win, the amount wagered is added to the end of the sequence. After a loss, the first and last numbers are crossed off. The sequence grows with wins and shortens with losses. 

Reverse Labouchere

• Category: Positive progression 
• Mechanic: Stake = sum of first and last numbers in sequence. Add the amount after a win; remove first and last numbers after a loss. 
• Reset condition: The sequence ends when all numbers are crossed off (after losses) or when the player chooses to stop. 

Negative progression systems increase the stake after a loss. The structure of each system differs in how quickly stakes escalate and when they return to base. These systems do not guarantee recovery of losses; they determine the order and size of stake adjustments. Stakes can escalate significantly over a losing run.

Martingale betting system

The Martingale is the most widely known negative progression system. The stake doubles after every loss. After a win, the stake returns to the base amount. 

Martingale

• Category: Negative progression 
• Mechanic: Double stake after each loss. 
• Reset condition: Return to base stake after any win.

Sequence example using a 1-unit base stake: 1 (loss) > 2 (loss) > 4 (loss) > 8 (win) > reset to 1. Stake doubles on each loss regardless of how many losses occur consecutively.

Grand Martingale betting system

The Grand Martingale follows the same doubling-after-loss principle as the Martingale but adds one additional unit to each increased stake. Stakes escalate at a faster rate than the standard Martingale. 

Grand Martingale 

• Category: Negative progression 
• Mechanic: Double stake after each loss, then add one additional unit. 
• Reset condition: Return to base stake after any win. 

Sequence example using a 1-unit base stake: 1 (loss) > 3 (loss) > 7 (loss) > 15 (win) > reset to 1. Each step is double the previous stake plus one unit.

D'Alembert betting system

The D'Alembert system adjusts stake by one unit at a time. The stake increases by one unit after a loss and decreases by one unit after a win. The stake cannot fall below the base level.

D'Alembert 

• Category: Negative progression 
• Mechanic: Increase stake by one unit after a loss. Decrease stake by one unit after a win. 
• Reset condition: Stake returns to base when it has been reduced back to the original starting amount. 

Fibonacci betting system

The Fibonacci system uses the Fibonacci number sequence (1, 1, 2, 3, 5, 8, 13, 21...) to determine stake sizes after losses. After each loss, the stake moves one step forward in the sequence. After a win, the stake moves two steps back. The sequence resets to the start after returning to the first position.

Fibonacci 

• Category: Negative progression 
• Mechanic: After a loss, advance one step in the Fibonacci sequence. After a win, move two steps back. 
• Reset condition: Sequence resets to position 1 when the stake reaches the start of the sequence. 

Labouchere betting system

The Labouchere system begins with a player-defined number sequence. The stake for each round is the sum of the first and last numbers. After a win, those two numbers are crossed off the sequence. After a loss, the amount staked is added to the end of the sequence. The system is complete when all numbers are crossed off. 

Labouchere 

• Category: Negative progression 
• Mechanic: Stake = sum of first and last numbers in the chosen sequence. Cross off both numbers after a win; add the staked amount to the end after a loss. 
• Reset condition: Sequence is complete when all numbers have been crossed off following wins. 

Example sequence: 1-2-3-4. First stake is 1+4=5. Win: cross off 1 and 4, leaving 2-3. Next stake is 2+3=5. Win: sequence complete. A loss at any point adds the staked amount to the end of the sequence. 

The systems in this category do not follow a simple win/loss progression. They use fixed bet structures, observation-based tracking, or a specific combination of table positions rather than adjusting stakes based on the previous result alone.

James Bond betting system

The James Bond system places a fixed set of bets covering a large portion of the table in the same configuration every round. The standard allocation uses three table areas simultaneously and does not change from round to round. 

James Bond 

• Category: Fixed bet structure 
• Mechanic: Standard allocation per round: high numbers (19-36), a six-line bet (13-18), and the single zero. Specific chip distribution: e.g. 14 units on 19-36, 5 units on 13-18 split, 1 unit on 0. 
• Reset condition: No stake adjustment between rounds. The same allocation is placed every round.

The 20-number coverage (19-36, 13-18, and 0) means that only numbers 1-12 produce a losing round. 

Andrucci betting system

The Andrucci system involves tracking results over a set observation period, then concentrating bets on numbers that have appeared frequently during that period. It is based on observation of results, not on mathematical probability.

Andrucci 

• Category: Observation-based 
• Mechanic: Track results over a defined period (typically 30 to 37 spins). Identify numbers that have appeared more than once. Place straight-up bets on those numbers for a set number of subsequent rounds. 
• Reset condition: No stake progression rule. Bets return to observation phase after the defined betting period. 

Note: Each spin is an independent event. A number appearing frequently in the observation period is not more likely to appear in future spins. The Andrucci system is based on observation, not on any mathematical principle or probability adjustment. 

Romanosky betting system

The Romanosky system covers a high proportion of the table using a fixed combination of outside bets and inside bets. The specific combination varies, but the common structure aims to cover 32 of the 37 pockets in a single round.

Romanosky 

• Category: Fixed combination bet 
• Mechanic: Place two dozen bets (or two column bets) covering 24 numbers, plus four corner bets covering 8 additional numbers. Total coverage: 32 pockets. Zero and four uncovered numbers produce a loss. 
• Reset condition: No stake adjustment between rounds. The same combination is placed every round.

Kavouras betting system

The Kavouras system uses an irregular distribution of bets across 20 numbers on the wheel. Rather than covering a neat section, the bet positions are spread to include numbers from different zones of the wheel simultaneously. The number of chips and their placement is fixed. 

Kavouras

• Category: Fixed multi-position bet 
• Mechanic: Place 8 chips across 20 numbers using a combination of one corner, two splits, and one double street, plus additional straight-up bets on selected numbers. Specific chip positions: 0-1-2-3 corner; 31-32, 8-9, 5-8 splits; 22-24 double street; and straight-up bets on 0, 1, 4, 7, 12, 14, 20, 27, 33. 
• Reset condition: No stake adjustment between rounds. Fixed placement is repeated every round. 

Every system on this page operates on the same principle: it determines how much to stake and when. That is the full extent of what any system controls. 

Several persistent beliefs attach themselves to betting systems. The three below come up frequently and are worth addressing directly. 

Misconception 1

A system can recover losses: Negative progression systems increase stakes after losses, which means a single win following a run of losses can return the session to a net position. This can happen. However, there is no upper bound on how long a losing run can last, and table limits cap how high stakes can go. No system guarantees that a winning result will arrive before the loss exceeds the available bankroll or the table maximum. 

Misconception 2

Numbers that have not appeared recently are due: Each spin is an independent event. A number that has not appeared in the last 30 rounds has exactly the same probability of appearing on the next spin as it did at the start of the session: 1 in 37 on a single-zero wheel. The wheel has no memory. This is why the Andrucci system is described in this page as observation-based, not probability-based. 

Misconception 3

Short-term variance proves a system works: Over a short series of rounds, any outcome pattern is possible. A player could follow the Martingale for 20 rounds and finish ahead. That reflects variance within a random system, not evidence that the system improves outcomes. Over a large number of rounds, results converge toward the mathematical expectation of the game. 

Betting systems and roulette strategy are distinct topics that are often used interchangeably but describe different things. 

Common questions about roulette betting systems, answered directly.