The 1326 Roulette System. We Explain….
The 1326 System is a variant of the Paroli System and is focused on the objective of a achieving a streak of four wins. Choose your betting unit (either 1, 2 , 5 for example) and multiply this number against the index units in the explanation below.
Bet one unit on your initial betting round, three units on your 2nd round, 2 on the next round and six units on the last.

As an example to illustrate the 1326, let´s say you are betting with units of 3 and that you are betting on on red and black.

Kick off with a bet of £3. In a win scanario, you would add £3 to the £6 on the table so your next bet is £9. (3 units)
If you get lucky again, you would have £18 in your pot. Your next bet is £6 (2 units) so take away £12 from the pot. If you win again, you have £12 plus the £12 you held back making a total of £24. Your final bet is £18 (6 units), so take £6 away. If you win this one, your final pot is £36 + £6 = £42.
The 1326 sounds complicated, but basically what you are doing is skimming some of your profits along the way in a win situation

Now let´s look at the other side of the coin- where you lose. If at any point you lose, stop the progression and start back at the beginning. The 1326 strategy is risk limiter.
Let´s take the above sequence with the £3 unit bets. If you lose the initial bet , you are down £3. If you get unlucky at at the second level you are down £6 and at the next level, if you lose you actually walk away with a profit of £6 (since you bled off £12). If you lose at the last stage, you are neither up nor down.

The advantage of the 1326 strategy is that you are risking £6 for the chance of generating £36 net profit (in the example above in any case where your units are worth £3)

But remember, you may have a terrible run of luck and lose at level 2 in successive rounds. No strategy is perfect. Just remember to understand the roulette strategy that you are employing, get behind the numbers and then use them to play methodically. No system will fundamently change your odds in roulette.