This system is a little more sophisticated, but the results can be as devastating as our old friend Martingale. It is a series of numbers, each of which is the sum of the last two numbers in the system, like this: 1-1-2-3-5-8-13-21-34-55-89-144. Advice about betting it varies, but one of the more common is to bet the series as you lose. If you win a bet, fall back one in the series If you win that one, start over, if you lose, continue on in the series.

The six and eight can each be made five ways. So if you are up on the don't six, you have six ways to win (on the number seven) and five ways to lose. When the bet is $10 you would win $60, lose $50, and be ahead by $10 after the 11 decisions (on average) If you see a don't player about to take his bet down just say to the fellow: "Don't! Here's 10 bucks, you're even!" He'll take the $10 because that's what his bet is.