Roulette

Roulette is one of—if not the—most famous casino games in the world.

Its popularity is largely due to its simplicity. However, it is far from being a game of “pure luck.”

Its betting structure raises several mathematical strategy aspects that make it particularly interesting.

What is the Goal of Roulette?

The general goal of roulette is to make a correct prediction about the outcome of the spin. This prediction can have different levels of specificity, and the player’s mission is to choose their own goal for each round.

Players can choose their target from the following categories:

Color Choice: Predicting whether the ball will land on a red or black pocket… or the green one.
Parity Choice: Predicting whether the number will be even or odd.
Magnitude Choice: Predicting whether the number will be low (1 to 18) or high (19 to 36).
Block Choice: Predicting whether the number will belong to a specific dozen or column.
Proximity Choice: Predicting whether it will land within a restricted group of numbers.
Number Choice: Predicting whether it will land on an exact number.

What are the Elements of Roulette?

It is also important to understand the fundamental components of the game:

The Wheel (Cylinder): Features numbered pockets from 1 to 36, alternating between red and black, plus one or two green pockets for the zero.
The Ball: A small sphere launched into the cylinder in the opposite direction of the wheel’s rotation.
The Layout (Betting Mat): The grid where players place their chips to indicate their bets.

Different Roulette Variants

Not all versions of roulette are the same, and it is crucial to be aware of this. The three main variants feature distinct characteristics that impact your odds:

European Roulette

Structure: 37 numbers (1 to 36, plus a single zero).
House Edge: 2.70%

French Roulette

Structure: 37 numbers (1 to 36, a single zero), but featuring a distinct table layout.
House Edge: Can drop to 1.35% on even-money bets due to special rules called La Partage and En Prison.

American Roulette

Structure: 38 numbers (1 to 36, a zero, and a double zero).
House Edge: 5.26%

Types of Bets and Payouts

Roulette bets are divided into two major categories: Outside Bets (outside the numerical grid) and Inside Bets (inside the numerical grid).

Outside Bets

Outside bets carry lower risk, and consequently, their payouts are lower. These bets cover large groups of numbers:

Red/Black: Payout 1:1
Even/Odd: Payout 1:1
High/Low: Payout 1:1
Dozen: Payout 2:1
Column: Payout 2:1

Inside Bets

Inside bets involve higher risk, and therefore, their payouts are much higher. These bets are placed directly on the numbers or the lines that separate them:

Straight Up (Plein): A bet on a single number, including the zero. The chip is placed in the center of a specific number. Pays 35:1.
Split (Cheval): A bet on two adjacent numbers on the layout. The chip is placed on the line dividing them. Pays 17:1.
Street (Transversale): A bet on a horizontal row of three numbers. The chip is placed on the outer lateral line of the row. Pays 11:1.
Corner (Carré): A bet on a block of four neighboring numbers on the layout. The chip is placed on the intersection of the lines. Pays 8:1.
Six Line (Sixain): A bet on two adjacent “streets.” The chip is placed on the outer lateral intersection. Pays 5:1.

Announced Bets (Call Bets)

In European and French Roulette, players do not only bet on the traditional layout. There is also the option to bet on the physical design of the wheel—meaning numbers that are neighbors to one another.

To facilitate this, modern tables use the Racetrack (or pista): a visual extension of the betting layout that mimics the exact order of the numbers on the physical roulette wheel. While the traditional layout organizes numbers sequentially, the racetrack organizes them by their real physical position on the cylinder.

These advanced bets are structured as follows:

Voisins du Zéro (Neighbors of Zero): Covers the 17 numbers surrounding the zero. It requires 9 chips.
Tiers du Cylindre (Third of the Cylinder): Covers the 12 numbers directly opposite the zero. It requires 6 chips.
Orphelins (Orphans): The 8 numbers that do not belong to either of the previous categories. It requires 5 chips.
Jeu Zéro (Zero Game): The zero and its 6 closest neighbors. It requires 4 chips.

The Secret of the Professionals

The case of French Roulette is highly specific. It features particular rules that cut the casino’s advantage in half on even-money bets (Red/Black, Even/Odd, High/Low) when the ball lands on zero (0).

La Partage: If the ball lands on zero, all players who made even-money bets lose only half of their stake. The other half is returned immediately.
En Prison: Instead of recovering half of the stake, your bet becomes “imprisoned” on the table for the next round. If you win the next spin, you recover your original bet in full, but you do not receive any profit. If you lose, you lose it all.

How a Round Works

The protocol for playing online roulette is virtually identical to that of a land-based casino:

Step 1: Open for Bets (Abertura das Apostas): Players begin placing their chips on the table. In brick-and-mortar casinos, players are given exclusive colored chips unique to them so the dealer can track each person’s bets. These must be exchanged for regular cash chips before leaving the table.
Step 2: The Spin: The wheel begins to rotate, and the ball is launched in the opposite direction. Even as the ball spins, bets are still allowed for a short duration.
Step 3: Closing the Bets: As the ball loses speed, the dealer announces “No more bets” (or “Não vai mais nada”). From that moment on, touching the chips is strictly prohibited.
Step 4: The Result: The ball comes to a stop in one of the pockets. The winning number is announced, along with its color, whether it is even/odd, and high/low.
Step 5: Clean-up and Payout: A marker is placed over the winning number on the table. Losing bets are collected, and winning bets are paid out. The marker used is known as the Dolly.
- Crucial Etiquette Rule: While the Dolly is on the layout, no player may touch, collect chips, or place new bets. Doing so will result in the bet being invalidated. Once cleared, the cycle restarts.

Table Minimum Rules (Inside vs. Outside)

To ensure a smooth gaming experience, you must understand how table limits apply differently across the layout:

If the table minimum is 5 units and you bet on the outside (e.g., Black), your individual bet must be at least 5 units.
If you bet on the inside, you can spread out 1-unit chips, as long as the sum of all your inside chips totals at least the table minimum of 5.

American Roulette: The Disadvantage

While American Roulette features a standard house edge of 5.26%, it includes a unique bet that alters the math for the worse. By placing a “Basket” bet (covering the first five numbers: 0, 00, 1, 2, 3), the house edge skyrockets from 5.26% to 7.89%, making it mathematically the worst bet in the entire game.

The Science Behind the Wheel

Roulette remains the perfect balance between the simplicity of chance and the depth of strategy. Far from being a one-dimensional game, its true wealth lies in the freedom given to the player: you are the one defining your own goal, risk level, and table coverage with every single spin.

To maximize your gaming sessions, always remember the three golden rules of the pros:

Always prefer European or French variants to cut the house edge in half.
Take advantage of the La Partage and En Prison rules on outside bets whenever they are available.
Master table etiquette, the use of the racetrack, and strictly respect the authority of the dolly.

Knowing the rules inside out does not change the casino’s long-term immutable mathematics, but it gives you absolute control over your bankroll and turns every spin of the ball into a strategic and thrilling experience. Define your goal, place your bet, and may variance be on your side!