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There is absolutely, unequivocally nothing illegitimate about keeping track of seen cards in blackjack

Fair enough. I just wouldn't want to mess with the large gentleman with the sunglasses and a wireless plug in his ear.

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The bottom line is that online poker is real poker, it is safe and your concerns are not practical concerns in real life day-to-day play.

Maybe it's just my professional background showing through, but I'm always looking for holes in the system. Certainly, if all of your opponents at a poker table were actually the same physical person, then their (collective) odds of beating you are quite significant. This would never happen in the real world, but online it's a legitimate concern. Even if the online casino has good security practices (e.g., requiring each gambler to have a separate credit card, separate IP address, and so forth), you could still have that many collaborators sitting in a room with that many PCs together and exchanging information on the side.

I guess the real question is, if somebody were cheating like this, how long would it take you to figure out that your losses were beyond random chance and pull out of the game?