Dozen and Columns Repeating
Rather than applying a system right away, I try first to identify if there are any special opportunities around. I observe the scoreboard of multiple Roulette tables and go for the one that is most likely to hit a winning bet having a few systems in mind. One opportunity that I particularly look for is the number of times a specific Dozen or Column has repeated.
When a Dozen repeats 4 or 5 times, I bet on the other two Dozens. It is pretty rare that a Dozen repeats more than 6 or 7 times. At least this is what I have personally seen and this is what the results of thousands of simulated spins show. In any event, I place 1 unit each on the two different Dozens that haven't come up for 4 or 5 times. In most cases, this wins the first time. If it doesn't win, I triple the amount of my bets and place them on the same two Dozens. The reason for the tripling is to get the same amount of profit, whether I hit the first time or the second time.
So, I'm really risking 8 units to get 1 unit profit, but since I have won more than 8 sessions using this method, losing 8 units on one session would still keep me ahead.
My unit value is $100. Applying this technique 5 times will profit you $500, should you grab the right opportunity.