If card counting in blackjack is just keeping track of high cards vs low, does that mean if I could remember all the different cards used (i.e. how many 5s, how many 7s) I would be really good at blackjack?

Question

This would break online casinos because you could easily do that with electronics. Assuming the casino itself is playing fair.

If you could perfectly keep track of how many of which cards are left in the decks, and everytime make the most mathematically sound bet, would the house still have an edge?

(I assume the correct answer will start off saying I don’t understand how card counting works – fair enough, but what about the basic explanation of it did I misinterpret?)

In: Mathematics

Answer 1

I’ll preface this by saying that I don’t know how frequently every online casino would re-shuffle the deck, but any information that you gained by card counting would be erased once the deck is shuffled and you’re starting from scratch again. If this happens after every hand, you won’t learn enough about what’s left in the deck to be able to use that knowledge in any meaningful way.