If you want to be in with a good chance of winning in roulette then there is a system that you can follow and it is called the Labouchere System. To use this system you need to create yourself a betting line which will ultimately dictate how much you bet on each spin. Here is an example:
1 – 2 – 1 – 3 – 1 – 5 – 2
The theory behind this system is that you take the left and right hand numbers and add them together and this is the amount you bet with. So for example in this instance the amount you bet with would be 3 as the first and last numbers added together equal to three. If this bet is won then you cross these numbers off your list and forget about them. You then go on to use the next two numbers, so in this case it would be 2+5 so your next bet would be 7 and so on. If you lose the bet however then you add the number you would have lost to the end of your list. So if you lost your first bet then the sequence would look like this:
1 – 2 – 1 – 3 – 1 – 5 – 2 – 3
You would then continue the sequence as normal. So your next bet in this case would be 4 as it would be the first and last numbers added together 1+3 and you would continue on like this.