An interesting six pages of forum discussion. Blackjackwarrior, what exactly do you define as "accuracy" in your last post? If you meant "certainty", I'd say you're correct, as the process of tracking the cards played and using this to inform playing and betting decisions is based on averages and probability. It's a volume endeavour, and over-time practitioners who engage in perfect card-counting will come out in front. That's not my opinion but what the math(s) indicate. If this was not the case, then why do casinos in the States spend so much time, effort and money each year on game protection?

With regard to your assertion that using a Martingale progression approach will provide an advantage, the math(s) show this is completely without basis. Yes, you may win some hands, and reverse out losses that wouldn't have happened if you hadn't doubled down (although this isn't an indication of an "advantage"), but again the averages will show through over time. Doubling down without knowing whether the composition of the cards still to be played are, on average, favourable (this is only the case around 20% of the time), will cause you to lose money over time, in the same way as perfect card counting will win money over time.

Play how you wish to, but arguing against the math(s) on this site, where there are so many math(s) savvy regular contributors, simply shows that you need to do some reading around the theories of probability and statistics as well as the basis of why card-counting does work. Why do you think it is that casinos don't look out for advantage players on the roulette or craps tables (being on the lookout for instances of cheating being something else entirely, although it all comes under the generic heading of "game protection")?

Best wishes from the UK.

Good cards.