Mr J, thanks.
May I add, this method is for fun, no I do not gamble, I hardly use the word, but more to the point I see each cent spent on my chosen "speculative" activities as pot luck.
In racing however, it's a different ball game, there are so many variables, I guess the strategy I use in horse racing, to apply on a roulette wheel, cannot work. but we have the ability to tinker up other strategies, and the casino is not a serious gamble as far as I a concerned. I like the food better!