The basics of card counting is that you assign values from 1, 0, to -1 for each card and adding the value of revealed cards to know if you have the odds in your favor for the next game.
2 to 6 is equal to 1, 7 to 9 is equal to 0 and 10 to Ace is equal to -1. The card counting technique is complex so I will leave a link.
Casinos have policies regarding this card counter schemes, blackjack having the lowest house edge needs to be supervised because card counters. It is not illegal or cheating but a casino has to earn and they will do anything in their power to prevent losses from card counters.
Here are some of the solutions that casinos employ.
- Solution 1: When casinos detect that someone is card counting(i.e. 100 bet now then suddenly 1000 bet). They will make a rule where players can't change their bet for the next round.
- Solution 2: They use 4 decks or 7 decks instead of the standard 6 deck shoe.
- Solution 3: The casino can call the police for trespassing which is shitty, if the house rules indicates that no card counting and you are caught card counting. This is not a good solution because it might be someones lucky day.
- Solution 4: They use automatic shuffler so you will have less confidence in your card counting skills
In my opinion, card counting is applicable to online and physical casinos. I think iit works better in online casinos because there is nothing the house can do. There are other solutions and the solutions above are applicable mostly in physical casinos.
How to count cards in blackjack link:https://www.blackjackapprenticeship.com/how-to-count-cards/