There is a technique of betting called Martingale. It was invented by the ancient casinos. This is the system where you have to double your bet after each loss where you have to turn back after each winning. As for example if you place a bet for $10 and you lose then you have to double your bet so make it $20 next. This time if you lose then make it double so $40 and so on. The steps are given below.
The above steps tell that you have won in the fifth bet but your net profit is $10. This is the specialty of this strategy. In any step you won your net profit will be same.