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Contents |
How card counting works in blackjack
Card counting is based on the fact that high cards, and especially aces, are good for the player while low cards are good for the dealer. High cards are good for the player because they increase the chance of a player getting a "blackjack", which usually pays 3 to 2. High cards also increase the player's chance of success on his pair splits and double downs. Low cards are good for the dealer because they decrease the chance that the dealer will bust.
Card counters raise their bets when the ratio of high cards to low cards in the deck is skewed in their favor. They also make strategy adjustments based on the ratio of high cards to low cards. These two adjustments to their betting and playing strategy can give players a small mathematical advantage over the house.
Contrary to the popular myth, card counters do not need savant qualities in order to count cards, because they are not tracking and memorizing specific cards. Instead, card counters assign a heuristic point score to each card they see and then track only the total score. (This score is called the "count".)
Different card counting systems assign different point values to various cards, but one of the most common systems, the Hi-Lo Count, is illustrative. In this system, the cards numbered 2 through 6 are counted as +1 and all tens (which include 10s, jacks, queens and kings) and aces are counted as -1. The cards 7, 8, and 9 are given a count of 0. The Hi-Lo system exemplifies a "level one" counting system; other counting systems also assign +2 and -2 counts to certain cards and are called "level two" systems. Many card counting experts agree that the additional accuracy derived from a "level two" system is offset by the increased difficulty of keeping count and the greater likelihood of making a mistake.
Another commonly used card counting system is the "K-O", an unbalanced card counting system derived from Arnold Snyder's unbalanced Red 7 count, published in 1981. The first blackjack researcher to publish an unbalanced card counting system was Jacques Noir, in his 1968 book Casino Holiday. Unbalanced card counting systems eliminate the need to estimate remaining decks to be dealt, a common source of player error in card counting.
History of blackjack card counting
American mathematician Dr. Edward O. Thorp is considered the father of card counting. His 1962 book Beat the Dealer (ISBN 0394703103) outlined various betting and playing strategies for optimal blackjack play. Although mathematically sound, some of the techniques described no longer apply as casinos took counter-measures (such as no longer dealing to the very last card). Also, the counting system described (10-count) is harder to use and less profitable than the point-count systems that have been developed since. A history of how counting developed can be seen in David Layton's documentary film, "The Hot Shoe."
Even before the publication of Beat the Dealer, however, a small number of professional card counters were beating blackjack in Las Vegas and casinos elsewhere. One of these early card counters was Jess Marcum, who is described in documents and interviews with professional gamblers of the time as having developed the first full-fledged point count system. Another documented pre-Thorp card counter was a professional gambler named Joe Bernstein, who is described in the 1961 book I Want To Quit Winners, by Reno casino owner Harold Smith, as an ace counter feared throughout the casinos of Nevada. And in the 1957 book, Playing Blackjack to Win, Roger Baldwin, Wilbert Cantey, Herbert Maisel, and James McDermott (known among card counters as "The Four Horsemen") published the first accurate blackjack basic strategy and a rudimentary card counting system, devised solely with the aid of crude mechanical calculators — what used to be called “adding machines".
From the early days of card-counting, some players have been hugely successful, including Al Francesco, the inventor of blackjack team play and the man who taught Ken Uston how to count cards, and Tommy Hyland, manager of the longest-running blackjack team in history. Ken Uston, though perhaps the most famous card counter through his 60 Minutes television appearance and his books, tended to overstate his winnings, as documented by players who worked with him, including Al Francesco and team member Darryl Purpose.
In the 1970s and 1980s, as computing power grew, more advanced (and more difficult) card counting systems came into favor. Many card counters agree, however, that a simpler and less advantageous system that can be played flawlessly for hours earns an overall higher return than a more complex system prone to user error.
In the 1970s Ken Uston was the first to write about a tactic of card counting he called the Big Player Team. The book was based on his experiences working as a "big player" (BP) on Al Francesco's teams. In big player blackjack teams a number of card counters, called "spotters", are dispatched to tables around a casino, where their responsibility is to keep track of the count and signal to the big player when the count indicates a player advantage. The big player then joins the game at that table, placing maximum bets at a player advantage. When the spotter indicates that the count has dropped, he again signals the BP to leave the table. By jumping from table to table as called in by spotters, the BP avoids all play at a disadvantage. In addition, since the BP's play appears random and irrational, he avoids detection by the casinos.
With this style of play a number of blackjack teams have cleared millions of dollars through the years. Well-known blackjack teams with documented earnings in the millions include those run by Al Francesco, Ken Uston, Tommy Hyland, various groups from the Massachusetts Institute of Technology (MIT) and, most recently, a team called "The Greeks". Ken Uston wrote entertainingly about blackjack team play in Million Dollar Blackjack (ISBN 0897460685), although many of the experiences he represents as his own in his books actually happened to other players, especially Bill Erb, a BP Uston worked with on Al Francesco's team. Ben Mezrich also covers team play in his recent book Bringing Down The House (ISBN 0743249992), which describes how MIT students used it with great success. See also the Canadian movie The Last Casino.
The publication of Ken Uston's books both stimulated the growth of blackjack teams (Hyland's team and the first MIT team were formed in Atlantic City shortly after the publication of Million Dollar Blackjack) and increased casino awareness of the methods of blackjack teams, making it more difficult for such teams to operate. Hyland and Francesco soon switched to a form of shuffle tracking called "ace sequencing". This made it more difficult for casinos to detect when team members were playing with an advantage. In 1994, members of the Hyland team were arrested for ace sequencing and blackjack team play at Casino Windsor in Windsor, Ontario, Canada. It was documented in court that Nevada casinos with ownership stakes in the Windsor casino were instrumental in the decision to prosecute team members on cheating charges. However, the judge ruled that the players' conduct was not cheating, but merely the use of intelligent strategy.
Countermeasures against blackjack card-counters
Counting cards in blackjack has become substantially more difficult as a result of casino countermeasures. The most common is the use of more decks, which decreases the player's advantage, but even in the few remaining single- and double-deck games, dealers will often shuffle prematurely or unusually frequently to defeat a suspected card-counter. However, for the casinos there is a downside to frequent shuffling: It reduces the amount of time that the noncounting players are playing and consequently losing money to the house. It has become common for casinos to use automatic shuffling machines to compensate for this. Some models of shuffling machines shuffle one set of cards while another is in play. Others, known as Continuous Shuffle Machines (CSMs) allow the dealer to simply return used cards to a single shoe to allow playing with no interruption. Because CSMs essentially force minimal penetration, they remove almost all possible advantage of traditional counting techniques. As a result, some blackjack players call for a boycott of tables using CSMs. In the case of online casinos, the deck is shuffled at the start of each new round, ensuring the house always has the advantage. However, some online casinos periodically animate the dealer shuffling the cards to give the illusion that the cards are shuffled infrequently.
Unfavorable rules can cut into a player's advantage, such as no double down after splitting, and having the dealer hit a soft 17 (ace, six which can play as 7 or 17.) Starting around 2004 a number of casinos began offering a 6:5 payoff on player blackjacks instead of the more traditional 3:2 payoff. These games are generally single-deck, inviting unwary card-counters and other players who believe they have an advantage. The inferior payoff substantially increases the house edge and makes the game unbeatable, even by a card-counter who is practicing the most sophisticated system perfectly.
A pitboss who determines that a player is a card-counter might either "back off" the player by inviting him/her to play any game other than blackjack, or will ban him/her from the casino itself. In jurisdictions where this is not legal, such as Atlantic City, a pitboss can require the player to flat-bet and disallow players from entering in the middle of a shoe. Such countermeasures effectively remove any chance of gaining an advantage from card counting in multi-deck games. The player's name and photo (from surveillance cameras) may also be shared with other casinos and added to a database of card-counters and cheaters run for the benefit of casino operators. One such blacklist was known as the Griffin Book, and was maintained by a company called Griffin Investigations. However, the Griffin Agency was forced into bankruptcy in 2005 after losing a libel lawsuit filed by professional gamblers.
Many casual card counters make small mistakes that cost the advantage they gain by counting. Two or three mistakes per hour may give back all of the counter's advantage. Even if one can count perfectly when practicing at home, it is much more difficult in an actual casino. The loud, distracting environments of most casinos, and even the availability of complimentary alcoholic beverages, play roles as casino counter-measures.
Casinos look out for known card counters, who may be banned from play depending on regulatory commission rules. They also look for suspicious actions such as a long series of small bets followed by large one. Monitoring player behavior to assist in this identification falls to on-floor casino personnel ("pit bosses") and casino surveillance personnel who may use video surveillance ("the eye in the sky") as well as computer analysis to try to spot playing behavior indicative of card counting; early counter-strategies featured the dealer learning to count the cards themselves to recognise the patterns in the players. In addition, many casinos employ the services of various agencies, such as Biometrica, who claim to have a catalog of advantage players. If a player is found to be in such a database, he will almost certainly be stopped from play and asked to leave regardless of his table play. For successful card counters, therefore, skill at "cover" behavior to hide counting and avoid "drawing heat" and possibly being barred, may be just as important as playing skill.
Casinos may alter the game's dynamic against card counters by raising the minimum or lowering the limit on a table with a suspected counter, or by reshuffling sooner than the normal end of the shoe if they think that the player is offering a large bet on a positive count.
There have been some high-profile lawsuits involving whether the casino is allowed to bar card-counters. Essentially, card-counting, if done in your head and with no outside assistance from devices such as blackjack computers, is not illegal, as making calculations within one's own mind is not an arrestable offence. Using an outside device or aid, however, was found illegal in a court case in Nevada involving Keith Taft, a professional gambler known for his innovations in blackjack computers and other gambling technology. In this case, two members of Keith Taft's team were convicted of cheating for using a video device to gain knowledge of a blackjack dealer's hole card. At the time of the Taft team trial, however, there was no anti-device law in Nevada, and the law that was written after this case is considered by many attorneys to be unconstitutionally vague. Still, the law has been adopted by most other states with casinos, and no player has yet tried the constitutionality of the law.
Casinos don't tolerate card counters or practitioners of other legal professional gambling techniques willingly and, if permitted by their jurisdiction, may ban counters from their casinos; in Nevada, where the casinos are ruled to be private places, the only prerequisite to a ban is the full reading of the Trespass Act to ban a player for a year. Some skilled counters try to disguise their identities and playing habits; however, some casinos have claimed that facial recognition software can often match a camouflaged face with a banned one. In the experience of most professional gamblers, this is untrue, and a 2004 book by a Las Vegas casino surveillance director, The Card Counter's Guide to Casino Surveillance, also declares this assertion to be an overstatement. Approximately 100 casinos in the United States used the Griffin Investigations consulting firm to help them track down and monitor card counters, before the firm's bankruptcy as a result of a lawsuit for libel filed by professional gamblers.
Other modern technology that has been marketed as an aid in catching card counters includes the MindPlay system and Blackjack Survey Voice software.
See also
External links
- Blackjack Forum Online has numerous articles on card counting
- Web Games Casino - Free Online Casino Gaming
Categories: Blackjack | Gambling terminology
