The most common betting systems that players use for roulette are geared towards Red and Black, but after that it is probably the Dozens and Columns.

The record was registered in 1943, when red color came up 32 times in a row! The probability of such event in French Roulette is (18/37)32 = 0.96886885 with the corresponding odds 10,321,314,387:1. The probability of losing eight bets in a row is (19/37) 8 =.004835. So, you have 99.52% of winning one unit, and 0.48% of losing 255 units. On average, in single-zero roulette, how often will a number repeat (ex. Two 8s in a row) over the course of 36 spins? Jon from Danville, New Hampshire.

To cover them quickly, there are three different Dozen bets on the roulette table marked as: 1st 12, 2nd 12 and 3rd 12.

There’s also 3 Column bets marked on the table as 2 to 1. The first Column covers numbers 1 to 34, the second covers numbers 2 to 35 and the third covers numbers 3 to 36.

So in total you have 6 bets, each of which covers 12 numbers (just less than a third of the wheel), they each have the same odds of hitting on any given spin and they all have the same payout which is 2:1. So if you bet £1, you will win £3 back.

Royal Panda are the best online casino for Dozen/Column betting. The have extremely flexible limits for each Dozen/Column and they pay out within 24 hours with no hassle when you win. Play at Royal Panda

The two main strategies that you can use for the Dozens and Columns are covered on our page on the Martingale Roulette Strategy but there’s so many sequences covered there for various parts of the wheel that it can be overwhelming, so we shall cover it again here on its own.

Strategy 1 – You pick a Dozen, any of them, and you bet on it with £1 (you can scale down to 10p if you like and divide the numbers below by 10). Then if you lose, you use the following betting sequence until you win:

1 – 1 – 2 – 3 – 4 – 6 – 9 – 14 – 21 – 31 – 47 – 70 – 105 – 158 – 237 – 355

As long as you win on any of those numbers, you will have a small profit. The obvious downside is that if you don’t get a win within that sequence, you have a big loss on your hands. Another downside is that because you’re covering less than a third of the table, you’re going to lose a lot more bets than you win over the long term of play. Here’s a table that shows how much you’ve lost in total at each stage of the progression.

Martingale On Dozens/Columns, Starting With A Bet of 1 £/$/€
Losses	Bet Placed (£/$/€)	Total Loss	Profit If The Bet Wins
1	1	1	2
2	1	2	1
3	2	4	2
4	3	7	2
5	4	11	1
6	6	17	1
7	9	26	1
8	14	40	2
9	21	61	2
10	31	92	1
11	47	139	2
12	70	209	1
13	105	314	1
14	158	472	2
15	237	709	2
16	355	1064	1

As you can see, after 15 losses in a row your total loss will be £709 and your next bet will need to be £355 to cover the previous losses which is a total outlay of £1,064. Here are the odds of getting 15 spins in a row without your Dozen/Column hitting:

European Roulette: (25/37)^15 = 0.2793% – This works out at 1 in 358 chance.

American Roulette: (26/38)^15 = 0.3372% – This works out at 1 in 296 chance.

Just to give you an idea of what to expect, when playing roulette online,we have seen over 30 spins in a row without a Dozen or Column hitting and when this happens you will lose. If you test this out on any of our Free Roulette Games you will soon see a long losing run for yourself.

To get around this, people try and wait for 10 spins without a Dozen or Column hitting and then bet on it. Maybe even wait 20 spins before betting on it. This is known as fallacy though and doesn’t alter the odds of the game.

Strategy 2 – The problem with the above strategy is that you aren’t covering a large enough portion of the table so you get lots of losses. If you want to cover more of the table, you can bet on 2 Dozens at the same time instead. This is the progression that you would need to use:

1 – 3 – 9 – 27 – 81 – 243

As you can see, the numbers soon get very big and that’s because you need to times your bets by three after every loss (x3). The upside to this is that you’re covering just less than 2/3 of the table and you will get more wins than losses.

But with a steep progression like that, it only takes a few losses in a row to give you a big loss that is hard to recover from. As with the first system, some players try ideas such as waiting until the same Dozen has hit three times in a row and then bet on the other two, but this again is fallacy and doesn’t change the odds of the game.

No matter what strategy you use, you should set yourself a stop loss and target win and stick to it. For example, with the first strategy above, if you decide that you’re going to walk away if you lose the 47 bet, walk away rather than chasing losses.

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Odds Of 7 Reds In A Row Roulette

Here it is... from your 'parent' site....an answer given to a question....
What would be the odds of having a red number turn up 18 times in a row on Roulette. - Doug Jeffrey from Eugene, USA
(18/38)18 =~ 1 in 693745. Nov. 11, 2001
how can you apply a forward prediction like that???... but then not be theoretically allowed to intercept at the 12 in a row point and bet against a 1 in 693745 chance?? Please explain

If you 'jump in' after 12 red spins in a row, the probability of there being a streak of 18 reds (where the last 12 spins are the first 12 of the streak) is much higher, calculated as follows:
(1/1)^12 * (18/38)^6 = 0.011296 = 1 in 88.525125
The original question was referring to 18 future spins. If 12 have already occurred, then it is only a question of 6 future spins.
The first 12 were red, so the probability of those spins being red is 100%, not the 18/38 per spin that it was before their outcomes became known. The probability of the 6 unknown future spins being red is still 18/38 per spin.

and...if you look at this situation after it has happened... 18 spins..18 reds...are you then allowed to look back and say...what happened there was a one in half million...or whatever that figure is...of happening?????

You could look back at the last 18 reds and say 'That particular sequence had a 1 in 693,745 chance of occurring' ... but you can also say the exact same thing about any 18-spin sequence where no numbers were green.
Just keep in mind that it has no bearing whatsoever on what will happen on future spins. The past does not matter.

JB...thanks for your help on this...I'm keen on a reply on the last point....what yu said in your last reply....unfortunately has me believing....that you can legitimately expect to win....if you jump in at 12 reds...and bet the next 6 blacks....based on a theory that 18 reds in a row is a one in approx half million chance!........and on those 6 bets you stake it small to win small....over and over......in 20 000 spins...you'll risk $50.....to win $30.......might you win significantly more often than you lose?

Regardless of when you 'jump in', your odds for the next spin are always the same:
red: 18/38
black: 18/38
zero: 2/38
In the long run, you will always lose 5.26% of whatever you bet, regardless of when you bet. (Assuming double-zero roulette)

I see that....Let me ask you this question JB....does it confuse you at all that you can look back on a sequence and accurately say those 18 spins in a row being even was a 1 in half million chance.......but .......that said......you cannot jump in at 12 evens in row and bet against that sequence of 18 happening.....does that confuse you just a little...or is it clear to you....it might be a state of mind thing that I just cannot grasp....

It doesn't confuse me, because the past does not affect the future when you're talking about random, independent events such as spins of a roulette wheel.Let's attack this from another direction.
Assume that somewhere there is a casino that has a jackpot bet for 18 Red/Black/Odd/Even/High/Low in a row.

Roulette Odds Black In A Row

Do you think that the casino would let you place your bet after 12 in a row had already hit?

Odds Of 8 Red In A Row Roulette

Remember: For every gambler that looked at the display at the roulette table and said 'Look honey. Red came out 12 times in a row! We should bet on black,' there was another sucker that said 'Look honey. Red came out 11 times in a row! We should bet on black.'

Roulette Odds 1 12