A Short History of Card Counting, from 1956 to Today

By CardCount Academy · Reviewed October 5, 2026 · 9 min read

Card counting was not discovered by a gambler with a system. It came out of mathematics papers, early computers and a handful of people who took a casino game seriously enough to calculate it. Knowing the history explains why the methods look the way they do — and why casinos deal blackjack the way they do today.

Timeline

1956: the first correct strategy

Until the 1950s, advice on how to play blackjack was folklore. Then four US Army analysts — Roger Baldwin, Wilbert Cantey, Herbert Maisel and James McDermott — worked out the correct play for every hand using desk calculators, and published it in the Journal of the American Statistical Association in 1956 as "The Optimum Strategy in Blackjack". Their result was remarkably close to the basic strategy used today, and it showed that the house edge in blackjack was far smaller than anyone had assumed. They are remembered as the "Four Horsemen".

1962: Beat the Dealer

Edward O. Thorp, a mathematician then teaching at MIT, read the paper and saw what it left out: blackjack is dealt without replacing the cards, so the odds must change as the deck is used up. Using an IBM 704 computer, he calculated how the removal of each rank affected the player's expectation, found that a deck short of small cards favored the player, and designed systems to track it.

He presented the mathematics in 1961 and published Beat the Dealer in 1962. The book reached the bestseller lists and changed the game permanently. Its main system, the Ten Count, tracked the ratio of tens to other cards: powerful, but demanding to use.

Casinos reacted. In 1964, Las Vegas casinos briefly changed the rules, restricting doubling down and the splitting of aces. Players stayed away, and the original rules returned within weeks. The lasting changes came more quietly: more decks, shuffling earlier, and watching for players whose bets rose and fell with the cards.

1963–1966: Hi-Lo

In 1963 Harvey Dubner proposed a much simpler approach: add one for each small card, subtract one for each ten or ace, and divide by the decks remaining. Julian Braun, a programmer at IBM, ran the large-scale simulations that turned it into a complete strategy, and Thorp included it in the 1966 revised edition of his book. This is the Hi-Lo count still taught everywhere, including here.

The following years produced many variations, including Lawrence Revere's point counts and the Hi-Opt systems. The systems comparison shows how they differ.

The 1970s: teams and the big player

A solo counter has an obvious problem: raising a bet from the minimum to the maximum when the shoe turns good is conspicuous. In the early 1970s a player known as Al Francesco found a way around it. Several "spotters" sat at different tables, counting and betting the minimum. When a shoe became favorable, a spotter signaled a "big player", who walked up and bet large from the first hand — looking like a high roller rather than a counter.

Ken Uston, a former stock exchange executive, joined one of Francesco's teams, wrote The Big Player about it in 1977, and went on to run his own. His later book Million Dollar Blackjack became a standard reference.

Computers in shoes, and the law

The 1970s also saw the first concealed computers. Keith Taft, an engineer, built a series of wearable machines operated with toe switches that played close to perfectly. Uston's teams used some of them. At the time no law prohibited it. Nevada closed the gap in 1985, making it a crime to use a device to track cards or calculate strategy in a casino — the line that still separates legal counting from illegal assistance.

Uston also took the fight over exclusion to court. In 1982 the New Jersey Supreme Court ruled in Uston v. Resorts International that Atlantic City casinos could not bar a player merely for counting cards. The legality guide explains what that did and did not change.

The theory matures

Alongside the adventure stories, the mathematics was being put on firm ground. Stanford Wong's Professional Blackjack (1975) gave practical index numbers and popularized back-counting — watching a table and entering only at a good count — to the point that the technique is still called "wonging". Peter Griffin's The Theory of Blackjack (1979) defined the measures used to compare systems, such as betting correlation and playing efficiency. Arnold Snyder showed how much penetration mattered and published the first widely used unbalanced count, Red Seven.

In 1986 Don Schlesinger demonstrated that a counter needed only a short list of playing deviations — the Illustrious 18 — rather than the hundred or more that earlier authors had asked players to memorize. Much of modern counting advice follows that spirit: fewer things, done accurately.

The MIT team

Around 1980, students and former students of MIT and other universities began playing blackjack as organized teams, run like small businesses: investors, written tests before a player was allowed to bet real money, and careful records. The teams operated in various forms through the 1990s using Hi-Lo and the big-player approach. Ben Mezrich's 2002 book Bringing Down the House, and the 2008 film 21, told a dramatized version of the story and introduced card counting to a new generation.

Simpler counts and the casino response

In 1998 Olaf Vancura and Ken Fuchs published Knock-Out Blackjack, whose KO count removed the true count conversion entirely. It marked the end point of a long trend: from Thorp's demanding Ten Count to systems almost anyone could learn.

Casinos, meanwhile, changed the conditions rather than the rules of arithmetic. Continuous shuffling machines, 6:5 payouts on blackjack, shallower cut cards and better surveillance all spread from around 2000 onwards. The countermeasures guide covers them in detail.

What has not changed

The central insight is the same as in 1962: blackjack has a memory, and a shoe rich in tens and aces favors the player. The explanation of how counting works on this site is, in essence, Thorp's. What has changed is everything around it — the number of decks, the depth of the deal, the payouts — which is why a modern counter spends as much effort choosing a game as counting it.

Sources and further reading

• Roger Baldwin, Wilbert Cantey, Herbert Maisel and James McDermott, "The Optimum Strategy in Blackjack", Journal of the American Statistical Association (1956).
• Edward O. Thorp, Beat the Dealer (1962; revised 1966).
• Stanford Wong, Professional Blackjack (Pi Yee Press).
• Peter A. Griffin, The Theory of Blackjack (Huntington Press).
• Don Schlesinger, Blackjack Attack: Playing the Pros' Way (RGE Publishing) — origin of the "Illustrious 18".
• Ken Uston, Million Dollar Blackjack (1981).
• Uston v. Resorts International Hotel, Inc., 89 N.J. 163, 445 A.2d 370 (Supreme Court of New Jersey, 1982).
• Olaf Vancura and Ken Fuchs, Knock-Out Blackjack (Huntington Press, 1998).
• Ben Mezrich, Bringing Down the House (Free Press, 2002).
• Nevada Revised Statutes 465.075 — use or possession of a device to obtain an advantage
• Wizard of Odds — Introduction to the High-Low Card Counting Strategy