I think it might be possible with live games, but not perfect as they tend to shuffle early, usually about halfway through the shoe. However I have noticed on some occasions you can get a lot of low cards stacked at the front of the shoe early, and then that can give you an advantage, if the true count gets to 3+ and over you can have a go at raising your bets, whilst you still have some time before they change the shoe... this has worked for me in the past.
But don't hold your breath...
I don't bother with it anymore...
I think some of the multiplayer tournaments don't shuffle after every hand, at least that is what I am led to believe. William Hill sent me an email advertising their multiplayer blackjack tournaments, with instructions on how to card count included. Advising players to learn this strategy and then log on and use the new found knowledge in their multiplayer blackjack tournaments to win. The advice they sent was a little bit different to how I learnt card counting. It advised players to divide the gross count by the number of half decks left in the deck to get the true count, so if there was 4 decks in play you would divide the count by 8 to get the true count, but I was taught to divide the gross count by the number of decks left in the shoe to get the true count, so if there were 4 decks still in play I would divide the count by 4 to get the true count.... It is a bit strange to be sent an email from a casino with instructions on how to card count and encouragement to try it out on their blackjack games. Unless it is a clever ploy to get people to lose more money, because the casino knows card counting is useless in online blackjack...
Tournaments I have found can become a matter of luck rather than skill, and although I experienced good fortune to begin with, now I am finding it difficult to win at tournaments, as I seem to be dealt a lot of dire hands at the moment, and going bust, or having a hard 17 which often isn't strong enough to beat the dealer. I enjoy playing them however, but now tend to just go for the free ones, or very cheap buy-ins, as the expensive buy-ins just seem too risky...
Online blackjack played with basic strategy can reduce the house edge to about 0.5% on most blackjacks except the dodgy ones... and could be used to win with bonuses in the past, but not anymore.... as blackjack is excluded from most bonus wagering requirements or given a 10% weighting... winning online blackjack online has become to me something unattainable, and I'm sure casinos love this game in its cyber form, because all strategies used to beat it in brick and mortar casinos are useless online, and basic strategy although reducing the house edge, still makes the player a long term loser...