# Strategies for Betting

Card counting is a card game strategy used in the blackjack family of games to determine whether the next hand will give a probable advantage to the player or dealer. Card counters are a kind of advantage players, who try to decrease the inherent house edge by keeping a running tally of all high and low cards seen by the player. Card counting allows players to bet more with less risk when the count gives an advantage as well as minimize losses during an unfavorable count. Card counting also gives the ability to change playing decisions based on the composition of cards that are left.
Card counting, also called to as card reading, often refers to getting a sufficient count on the number, distribution and high card location of cards in games such as contract-bridge,spades to increase the possibility of winning.
Basic card counting assigns a positive, negative, or zero value to each card value available. When a card of that value is dealt, the count is adjusted by that cards counting value. Low cards increase the count as they increase the percentage of high cards in the remaining set of cards, while high cards decrease it for the opposite reason. For instance, the Hi-Lo system subtracts one for each dealt 10, Jack, Queen, King or Ace, and adds one for any value 2-6. Values 7-9 are assigned a value of zero and therefore do not affect the count.
The goal of a card counting system is to assign point values that roughly correlate to a cards Effect of Removal (EOR). The EOR is the actual effect of removing a given card from play, and the resulting impact on the house advantage. The player may gauge the effect of removal for all cards dealt, and assess the current house advantage of a game based on the remaining cards. As larger ratios between point values are used to create better correlation to actual EOR with the goal of increasing the efficiency of a system, such systems use more different numbers and are broken into classes depending on such as level 1, level 2, level 3, and so on, with regards to the ratio between the highest and lowest assigned point values.