What is card counting, and does it really work?
Where the house edge comes from, why high cards favour the player, how large the real edge is — and why counting alone earns exactly nothing. The place to start if the subject is new to you.
Read →Card counting at blackjack
Card counting is not a trick and not a feat of memory. It is the systematic use of one rule of blackjack: the dealer must play by a fixed rule, and the player does not. Here it is taken apart piece by piece — how the systems work, what the law actually says, where it all began, and how large the edge really is.
Basics — where to start
Blackjack basic strategy
The full chart — hard hands, soft hands and pairs — with the logic behind the plays that feel wrong, and why it is the precondition without which counting is worth nothing.
Read →The basic strategy course
The chart, not as reading but as habit: hard and soft hands, pairs, surrender, and what changes when the dealer hits soft 17 or there is no hole card. Practised until the right move comes without thinking.
To the course →Systems — how the count is kept
The Hi-Lo system — the complete guide
The most widely used system, and every counter's starting point: the card values, the running count, the conversion to a true count, and what makes it the right balance between accuracy and simplicity.
Read →Eight counting systems, side by side
Hi-Lo, KO, Red 7, Zen, Omega II, Hi-Opt II, Wong Halves and Uston APC — every value of each, the mental cost of each level, and who each system suits.
Read →Legality — what is allowed, and where
Is card counting legal?
The short answer is that counting in your head is not a crime — but that is not the whole answer. Nevada, New Jersey's Uston ruling, the UK's Ivey case, the position in Europe, and what a casino can still do.
Read →History — how it began
From Edward Thorp to the MIT team
In 1962 a mathematician proved on an IBM 704 that the house edge at blackjack can be reversed. From there the road runs through Ken Uston to teams that turned it into a profession.
Read →Knowing how it works is not knowing how to do it
Counting is closer to a physical skill than to knowledge: it is measured by speed and accuracy under pressure, not by understanding. The course builds it in steps — 43 levels across nine tracks, from reading a single card's value to simulating a whole shoe. It is free, and runs in your browser.
This site is about the mathematics and history of blackjack, and about training a skill. It does not encourage gambling, does not link to gambling sites, and is not legal advice. Gambling laws differ between countries and states; check the rules where you live. Gambling can cause real financial harm — if it is harming you or someone close to you, seek help from a problem-gambling service in your country.