French and some European Roulette tables also utilize what are known as French or called bets. These refer to certain sections of the Roulette table that represented by corresponding numbers and phrases on an ellipse. These are Voisin du zero, Orphelins and Tiers du Cylindre, and are based on a particular section’s proximity to zero. The numbers within the ellipse function in a similar manner.
One way that you can ensure not to lose too much money – especially if you are playing online – is to concentrate on the outside bets. These bets only apply to boxes outside the numbered grid of the betting table and are for red or black, odd or even, or for groups of numbers either in rows or number bands. The odds are not as big but that means that there is more chance of winning.
The odds of you winning will always be 50/50. So you have a 50% chance of LOSING $1, and a 50% chance of WINNING $0.50. You can’t just double bet size after losses, because then all you do is increase the amount you risk. Sure you may get lucky and win, but what happens if you lose? You’ll lose big. So there is no escaping the unfair payouts UNLESS you know which side of the coin is more likely to appear. Then you would be changing the odds of winning. And if you won much more often than 50% of the time, then the unfair payout wont matter as much.
You don’t have to be a mathematical genius to excel at roulette but it makes sense to memorise the sort of odds you’ll receive for different bets. Although it’s unlikely that a croupier will make a mistake and underpay you, if you don’t know the odds of the bet you’ve placed, how are you supposed to correct them? Even if you’re only playing online roulette, it still pays to familiarise yourself with the odds you’ll receive for betting on different sections of the table. That way you’ll be able to calculate the possible return and can adjust your strategy accordingly. If you don’t know the difference between zero and double-zero roulette for instance, you don’t know how to calculate your odds and you’re just guessing. Don’t guess – calculate. We’ll show you how.
On an American wheel, there are 38 spots: numbers 1-36, plus 0 and 00.  Your odds of winning a one-number bet are 37 to 1 (37 ways to lose, 1 way to win).  But if you win, the casino doesn't pay you 37 to 1, they pay you less: 35 to 1.  The difference between the true odds and what they actually pay you is 2/38, or 5.26%.  You can do this same calculation for the other bets, and it comes out the same. 

Even if there isn't a betting limit, and if you have an infinite credit limit, it still doesn't really work, it just doesn't really fail either. If the martingale strategy is continued indefinitely and without regard to betting limits, your bankroll will hit arbitrarily high positive and negative values. The expected value is still negative, but the variation is so high that it your bankroll won't stay either negative or positive.
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