The winning method :D

The idea is to apply the powerful martingale system adapted to limitations put in place by the online casinos.

The big deal is to avoid a long serie of successive losses which will turn the martingale system ineffective.
Thus, the limitation due to the maximum amount you can bet falls because you do not reach it.

Starting bet

You must bet a starting sum D that can be bet 6x without reaching the maximum bet value allowed (Max) in order to have some margin. I call 'x' the 'multiply' or 'times' symbol.
To bet 6x is to make 1xD + 2xD + 4xD + 8xD + 16xD + 32xD + 1xD (expected profit) = 64xD.

You must therefore deposit at least 64 times the minimum authorised bet.

Let's take a concrete example: If a casino allows minimum bets of €2 on a virtual roulette table (or live, it doesn't matter), you'll need to deposit 2x64= €128 minimum to be sure you'll never run out of money in the event of 6 consecutive losses. If you are really defeatist, take a margin and deposit twice that amount, but by varying the simple chances to bet (see below) you have nothing to fear.

Note that you must have the maximum authorised stake in the bank, or 64x the starting stake. I recommend 150 Euros.

How it works:

Either I win, my winnings are D Euros.

Either I win, my winnings are D Euros.
Or I lose. I must then bet 2xD Euros on the next move ON THE SINGLE CHANCE OPPOSITE TO THAT CHOSEN ON THE PREVIOUS MOVE, i.e. black if I bet red or even if I bet odd.

Every time I lose, I double my previous bet by changing my single chance.

This must be done because online casinos unfortunately have the habit of bringing out long series of identical simple chances in order to limit the use of basic martingales.
In the same spirit, you should change the type of single chance every 20-30 bets. In other words, go from red/black to even/odd and then to pass/miss.

How to proceed