Hi guy , Welcome to this forum>
PLease learn a little bit about statistics so you understand your chances and your risks better.
Every spin the chance of your dozen NOT falling is ( on a european roulette with one zero) is 25/37 The next spin again the chance of loosing is 25/37 So the chance that your dozen does not fall 2 times is 25/37 * 25/37
So the chance that your dozen does not show 15 times is (25/37)^15=0,279% Seems good but please learn to interprete percentages too.
1% chance of loosing means that every 100 spins you suffer a loss!
so 0,1% chance means you loose big every 1000 spins
so 0,279% chance means you loose approx every 358 spins. So even when you play short time your risk that you start at spin 350 until 365 (;-) is quite high and sooner or later you loose your shirt.
Reality dictates that if you want to stand any chance you should have sufficient bankroll to survive not just 15 times but at least 20 times and preferably even 24 times ( when playing on dozens or columns)
If you can survive a row of 23 times that your dozen does not show your chances are 0,008198% to loose ( provided you can still do bet 24!)
A trick to do this is to wait 25-the num,ber of bets your BR or table limit allows. So if you can progress 15 times than you have to wait for your dozen to not show at least 10 times. Back side of this is of course that this means that you have to wait very long time before making a small profit. And this is where bots come in to do this tedious waiting work for us.
In most casinos the max table limit is preventing us from going to progression 24.
And now the nice (!) thing about statistics: they are only followed in very long sessions. So when you play a short session you may be UNLucky and get 2 times of your dozen not showing 27 x in a row but you can also be lucky and never ever see this happening and always win.
There are NO 100% guarantees in roulette. But reducing your chances of loosing the the max possible will at least give you a better chance and possibly never give you a loss.
Last example. IN real casino’s the max ever seen was a row of 26 x RED. So if you can design a systems to survive a row of 26 red then you may never have a loss. BUT the fact that this row of 26 once happened DOES NOT MEAN that this world will never see a row of 27 RED’s . Understand??
Cheers
CO