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Law of The Third

Online Roulette Guide

The Law of the Third System looks for “Hot Numbers” in a session.
Just remember: the wheel has no memory!

Best Casinos for the Law of the Third

law of the thirds

Here is a quick guide to the Law of The Third Roulette system. Please also read the notes at the bottom of the page. This system is similar in some ways to the Pivot System, in that you try and “fish” for numbers that repeat. Or in other words, you are looking for “hot numbers”.

There are several systems that use thirds- another one worth looking at is the Tier et Tout system. This system (like the Dozens to Columns Switch) uses the 2:1 Outside bets- the Columns and Dozens.

Is there such a thing? See below- we explain.

The Law of The Third

Here’s how to play Law of The Third Systems.

Quick Guide (More Detail Below)

  1. Write down the numbers as you sit it out at the wheel (if you are playing online you can make single unit low-risk bets like one on red, one on even etc).
  2. Wait for nine different numbers to drop in.
  3. Wait for two spins.
  4. Bet on all 9 numbers for three spins.
  5. Stop.

Pros and Cons

  • Easy to play.
  • Controlled Risk (only three bets)
  • You need to sit it out before you play. Best played on a live wheel. Or, just bet low on red/black at the start.
  • Assumes the wheel has a memory- which is doesn’t

More Details

Law of The 3rd System

Various roulette systems have been inspired by the statistical theory called The Law of The Third. Notice, we say “inspired”, as we want to be quite clear here- the theory has been adapted. That doesn’t necessarily mean that these systems work for roulette. It’s an interesting concept though, and worth a look.

Let’s take a quick run-through of how the Law of The Third works, which is all about statistical distribution.


Let’s imagine we are sitting around a European roulette table, with a wheel that has 18 red pockets, 18 black pockets and a green zero pocket. The total number of pockets is 37. So the odds of you guessing the right number on the next spin is 1 in 37 or 2.7%.

That’s not a big number. But if you map out the distribution of numbers over time, what the Law of The Third predicts is that on average, after you have seen 37 rounds of roulette, roughly two-thirds of the numbers (say around 25) will appear one or more times and one-third of the numbers will be no-shows (around 12).

Try it yourself and see what we mean. Similarly, 20 spins give out around 15 numbers and if you watch for 9 spins, only 6 may drop in (the lower the number, the more volatile this gets- the sample becomes too small).

Remember, we are talking statistics here- this is not an exact science, but it is amazing how often you will see this pattern.

Distribution Curve

Well, this phenomenon (like a bell curve of distribution on a chart) is used by some people to try and get an edge at the table. Well, that is what they chase, in any case. Let’s have a look.

One system we have seen hinges on the “every nine spins, six numbers appear” theory. In this system, you wait for nine unique numbers in a row, then you sit out another couple of spins (the safety stop), and you then play the nine numbers for three spins in a row (flat betting- keep the same bet for all three bets).

You are fishing for Law of Thirds repeaters. This pattern is one of the reasons that people like to bet on the dozens or the columns bet, both of which neatly split the wheel up into thirds (well almost, if we ignore that pesky 0 pocket for a moment)

Why use a safety stop? Well, I think that is more of an empirical thing- this worked when the system was being developed.

Science or Gobbledegook?

Well, the bottom line is that the roulette wheel has no memory. And this system is suggesting that the result of a spin is affected somehow by a historical event. So there is your flaw.

There are other “hot zone” strategies out there like the Quadrant roulette strategy, with which you will run into similar problems.

The problem with these kinds of distribution prediction systems is that they are modelling a group of spins (in this case 37) whereas you are betting on an individual spin. And there lies the problem. If you were making a bet on whether 24 numbers would hit over the next 37 spins, then it has more legs.

So play this system, but play it purely as a money management technique (to help you set a time to leave the table after you have hit a profit or hit your loss limit).

Don’t play it thinking it will somehow magically improve your odds at the table. It won’t.

Where to Play The Law of The Third Systems

Try this on the 3D Roulette at All British Casino.

This is a great variant, and All British is a roulette-friendly casino. They offer cash back on your losses.


Law of The Third
Trend Spotter
Risk Profile
Low to Medium
R17 Score
Main Flaw
The wheel has no memory