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Effects of Removal (EOR)

What is 'Effects of Removal (EOR)'?

Effects of removal (EOR for short) is a theory that has been popularized among card counters and experienced blackjack players to calculate the effect of a player's hand value when it comes to card removal. Essentially EOR is a set of data and the precise value of the EOR is worked out depending on the rules of the version of blackjack, along with the blackjack player's strategy. The exact value of the EOR can change, depending on whether there is a full shoe at the start of the round or not. The EOR is calculated by working out the difference between the player's expectation when they're faced with a full shoe of cards compared to their expectation if one of every rank was removed from the shoe.

'Effects of Removal (EOR)' Explained

Most experienced blackjack players who are familiar with EOR will generally start their calculations with a full shoe. This is because they know, without a shadow of a doubt, that a full shoe will be what every player is faced with when the dealer starts a new shuffle. If a blackjack player is employing a basic strategy, then they can start to work out the EOR based on the full shoe starting point. Seeing as the cards are played beginning at the starting point, the player's aim is to work out when the cards that are dealt result in an advantage for the player and when the cards dealt result in an advantage for the dealer.If the player is obeying the rules of a basic strategy and the blackjack game requires the dealer to stand on any soft 17, then the calculated values (EOR) can be figured out by the player. Considering that the values are relatively mathematically complex, only the most experienced card counters and blackjack players tend to make use of EOR.If, as stated above, a basic strategy is being played with a full shoe, then if a two is dealt it will result in a .38241 advantage for the player. The best card the player can hope to see is a five as this works out at a .69885 advantage. The worst card, on the other hand, is an ace. This results in a -.59566 advantage to the house. Further calculations are required if multiple decks are in play or the player is following a different strategy. Ultimately, if a player can master the calculations that go along with EOR, they will have a considerable advantage going into a game of blackjack. They will, however, have to ensure they don't get caught by the casino because if the house suspects them of card counting, they may find themselves not only escorted from the table, but banned from the casino altogether.
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