On online-casino-nodeposit.de I found "Spielansatz für Sechsertransversalen". Do you know it? Anyway, I´ll try to explain it in English. The bets should be placed on these well known double streets or six lines: 1-6, 7-12, 13-18, 19-24, 25-30, 31-36. And according to the German site we need at least 100 units to practice it. I tried it for fun in fun mode and won 160 units within 60 spins. Of course I am aware that this proves absolutely nothing.
As soon as a double street comes, we start with one chip there. Progression with four steps: 1-2-3-4. If we lose four times, we just leave this six line, untill it comes again. After winning we start again there with one unit.
Practicing this progression on all six double streets I soon found out, that it may continue forever and ever. I also realized that the bets are different from each other.
If we bet four double streets now, the number of chips wagered might be 1, 4, 2, 3. Four different amounts.