This system shows best results when betting on 50-50 selections, fixtures where both outcomes have (more or less) same expectation. Those bets are NBA spread and total bets; NFL spread and total bets; MLB total bets and MLB sides bets with odds from -125 to +110 (1.80 to 2.10 in decimal odds). Odds for each selection should be around -110 (1.91 in decimal odds).
If one selection has 50% chance of winning than double would have 25% chance of winning. This means that in the long run every 4th double bet would be a winner. Now, let me explain how to use this Doubles System. There is a simple formula that tells us how much money to bet each time:
YB = (EP + TL) / ((ODDS1 * ODDS2) – 1)
YB – Your Bet
EP – Expected Profit
TL – Total Loss (sum of all losing bets in a series)
ODDS1 – Odds for first selection in decimal odds
ODDS2 – Odds for second selection in decimal odds
Expected Profit is flexible, but the higher the profit greater the chance of losing your bankroll in case of bad run. I would suggest moderate EP (let's say 2 units) at the beginning and then to increase it up to 2.5 or 3 units.
For example let's assume that each time we bet, both selections will have odds of 1.91 (-110 in American odds). This means that our double will have odds of 1.91 * 1.91 = 3.65 (I would suggest accumulated odds between 3.00 and 4.50). Also let's suppose our bankroll is $1000 and our unit is $10 and that our expected profit is two units = $20. Our first bet would be:
($20 + 0) / ( 3.65 – 1) = $7.54
We lose, then our next bet is:
($20 + $7.54) / ( 3.65 – 1) = $10.39
We lose again, our next bet is:
($20 + $7.54 + $10.39) / ( 3.65 – 1) = $14.31
And again we lose, next bet is:
($20 + $7.54 + $10.39 + $14.31) / ( 3.65 – 1) = $19.71
Now, this bet is a winner, return is $19.71 * 3.65 = $71.94 and after we deduct all placed bets in the series we are left with profit of $71.97 - $19.71 - $14.31 - $10.39 - $7.54 = $20. After every winner our profit in the series will be 20$, series ends and next bet will be:
($20 + 0) / ( 3.65 – 1) = $7.54
Continue betting using the formula until hitting a winner and then again start the series from the beginning.
As I said before, if you only bet on fixtures with odds of around 1.91 (-110 in American odds) on the long run every 4th bet would be a winner. If we place one bet each day for a year we can expect to win 365 / 4 = 91.25 bets or to make a profit of 91.25 * $20 = $1825 and this is with a moderate unit of just 1% of the bankroll and the expected profit of 2 units.
What I do is to wait until doubling my bankroll, then I stop, recalculate the bankroll and new unit size and then continue from the beginning.
Of course, there will always be a cold streak or two, but in example of $1000 bankroll and $10 unit it would take 12 straight losing bets to lose your bankroll and with this odds it's statistically virtually almost impossible. Almost I say, but just to be on the safe side set yourself a limit of how much losing bets you can afford. Just as long as you follow a few simple rules this Doubles System will generate constant profit:
- Make a double bet using the formula
- If first double is a loser make another double bet and continue to do so until you hit a winner
- If you win, start the next series from Step 1
