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.

If we bet $1 on red and green or black occurs, then we lose the dollar that we bet. This results in net winnings of -1. The random variable X defined as the net winnings from betting on red in roulette will take the value of 1 with probability 18/38 and will take the value -1 with probability 20/38. First, consider what would happen if, on an American-style roulette table, you placed a one-dollar bet on each number. That’s a bet of $38. The payout tends to be 35:1, meaning that you’re paying $38 to get $36 back.

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.

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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:

Betting On 30 Numbers Roulette Games

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.

Betting On 30 Numbers Roulette Game

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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