The principle of this system is simple, take advantage of first-hitters and repeaters, because for every 3 numbers 1 is going to repeat
Start by betting 11 streets, exclude the one which has hit on last spin.
Another number comes and now you remove the street which the new number belongs, but you also place 1 chip of the same value straight up on the hitted number.
You continue on this fashion by removing the chips from the hitted streets one by one and betting simultaneously the hitted numbers where the streets' bets have been removed.
The total amount of streets that you bet will look like this: 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1.
The total of the numbers you are betting will look like this: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.
As you see the total amount of your bets never exceeds the 11 units, therefore by winning a street you get +1 unit net and by winning a number +25 units net.
You continue till you win a straight up bet and then restart by betting 11 streets.
We are going to cap the the total loss per round in 33 units (3 x 11) or less if you have already won street bets before you lose 3 times.
When you lose a round, repeat the process but this time with 2 units on each bet.
After each losing round increase bets by 1 unit, after each won round decrease by 1 unit.
Whenever you win a straight up number you stop right there and restart from the beginning, 11 streets betting.