Guides and Articles

Explanations and answers on card counting and on blackjack generally. Everything here is checked, and every number is computed rather than copied.

122 guides, in seven groups. If you know what you are after, jump straight to it. If you do not, start at the top of Card counting or follow the four steps below.

• 27Card countingHow it works, which system to use, what it actually earns, and the techniques beyond it.
• 30Playing correctlyThe rules, the chart, every close hand one page at a time, and the mistakes that cost most.
• 19The numbersOdds, what each rule is worth, and how much bankroll it takes to survive the swings.
• 9Side bets, pricedFrom 21+3 to Lucky Ladies, each with its house edge computed.
• 19Variants and other gamesSpanish 21, Switch, Lightning, Pontoon — and baccarat next door.
• 19Where you playVegas, the UK, every live studio priced, and what the law says about counting.
• 6History, questions and safetyThorp, the MIT team, the film — and where to get help.

Never done this before? Four steps

In this order. Each one takes an evening at most, and skipping ahead is the usual reason people give up.

1. Learn the game

   How a round runs, what the dealer must do, what each option means. Blackjack rules.

2. Learn the chart

   Basic strategy holds the house edge near 0.46%. Nothing else you do matters until this is automatic. Basic strategy.

3. Learn to count

   Six lessons that start from what a card is worth and finish at the true count. The counting course.

4. Practice until it is invisible

   A real round deals itself and you keep the count. The trainer.

Never counted before? Start here An interactive course that starts from zero From card values to the true count, one step at a time, with nothing left unexplained. Open →

Interactive trainer Practice counting at a real table A live round of blackjack is dealt, you keep the count in your head, and you enter it at the end. Start →

Card counting

The basics

• How card counting works – Hi‑Lo from scratch, the running and true count, and penetration.
• How to count cards, step by step – the order to learn it in, and how to drill at home.
• Running count – the tally you keep in your head.
• True count – the number you actually bet from.
• Penetration – the one condition that decides everything.
• Burn cards – why you make no adjustment for them, and when to start counting.

Which system

• The best counting system – Hi‑Lo against KO, Zen, Hi-Opt, and Omega II.
• Balanced or unbalanced? – what the shortcut actually costs.
• KO (Knock-Out) – unbalanced, no division needed.
• Red 7 – unbalanced, and the sevens split by color.
• Zen Count – level two, keeps the ace.
• Omega II – level two, needs an ace side count.
• Hi-Opt I – the simplest, and the weakest for betting.
• Wong Halves – the most accurate, and almost nobody should use it.

What it earns

• What counting earns – the honest hourly figure, computed step by step.
• Bet spread – the part that makes the money.
• Deviations – when the count overrules the chart.
• Hands per hour – and why speed cuts both ways.
• How many decks? – and the single-deck trap.

Beyond counting

• Advantage play – what it is, and what has stopped working.
• Wonging – counting from behind the table.
• Team play – splitting the counting from the betting.
• Hole carding – worth ten times counting, and unreliable.
• Hole carding Ultimate Texas Hold’em – where an exposed card is worth most.
• Shuffle tracking – fascinating, and effectively extinct.
• Counting in other games – poker, baccarat, Spanish 21, and where edge sorting fits.
• Does counting work online? – RNG versus live dealer, and where it still pays.

Playing correctly

Rules and the chart

• Blackjack rules – how the game is played, hand signals, and what each house rule costs.
• Basic strategy, built for your table – there is no single chart. Generate yours from the deck count and rules.
• Reading a strategy chart – what H, S, D, Ds, Rh and P mean.
• When to hit, stand, double, and split – every decision, quickly.
• When to split pairs – the split chart and the reasoning behind it.
• Double down – hard hands, soft hands, and the mistakes people make.
• Is insurance worth taking? – why the answer is no until you are counting.
• Dealer rules: S17 and H17 – what the dealer must do, and what each upcard makes.
• Can you use a strategy card? – yes, and where the line is.
• Table etiquette – signals, buying in, and what not to touch.

Hand by hand

• 16 against a 10 – the most searched hand in blackjack, and every option loses.
• 16 against a 9 – the closest surrender call on the chart.
• 16 against a 7 – you hit it, and you must not surrender.
• 16 against an ace – where standing is most expensive.
• 15 against a 10 – the thinnest decision in basic strategy.
• 13 against a 2 – one point higher and the answer reverses.
• 12 against a 2 – why a two is not a weak card.
• 12 against a 3 – the last cell where hitting still wins.
• 12 against a 4 – the cell published charts most often get wrong.
• 11 against an ace – the one hand the soft-17 rule decides.
• Soft 18 (ace-seven) – the most misplayed hand at the table.
• Soft 17 (ace-six) – the hand you never stand on.

What goes wrong

• How to win at blackjack – what works, what does not, and what each mistake costs.
• Every mistake, priced – ranked by cost, not by annoyance.
• Never busting – the habit that costs more than a 6:5 table.
• Myths – each one with the number that settles it.
• Betting systems – why every one of them fails.
• Losing streaks – how normal they are, and the one thing that is genuinely true.
• Does a bad player hurt you? – no, and the proof fits in a paragraph.
• Playing two hands at once – what it changes and what it does not.

The numbers

Odds and what each rule is worth

• Your real odds of winning – the probabilities, and what changes them.
• How often the dealer busts – the full table by upcard, both soft-17 rules.
• Odds of a blackjack – 4.75%, and why fewer decks help.
• Every rule, priced – what each table variation does to the house edge.
• Blackjack 3:2 against 6:5 – what the worse payout costs, with a calculator.
• European versus American blackjack – peek against no hole card, and the four cells it moves.
• Early against late surrender – why the good version vanished.
• DAS – double after split, and what it is worth.
• Five card Charlie – worth 1.5%, which is why you rarely see one.
• Shuffling machines – which kind ends counting.
• Card values – what each card is worth, and why tens run the game.
• Push – and why 9% of hands change everything.
• RTP explained – the same number as house edge, inverted.
• Glossary – running count, penetration, Wonging, back-off, and the rest.

Money and risk

• Variance – why you cannot tell if you are winning.
• Risk of ruin – the chance of losing it all.
• Bankroll – how much you actually need.
• The Kelly criterion – the correct bet size.
• Tax on winnings – US rules, including the 2026 changes.

Side bets, priced

• Side bets, priced – 21+3, Perfect Pairs, and what all of them really cost.
• What is 21+3? – how it is settled, how often each hand lands, and the house edge.
• Perfect Pairs – payouts, exact odds, and why more decks is better here.
• Lucky Ladies – 17.6% house edge, and the detail nobody states.
• Royal Match – wins a quarter of the time and still loses money.
• Over/Under 13 – the bet that got counted out of existence.
• Buster Blackjack – betting the dealer breaks.
• Bust It – the dealer-bust side bets.
• Can side bets be counted? – yes, and we computed where they turn.

Variants and other games

Blackjack variants

• Variants compared – the pattern they all share.
• Spanish 21 – what the missing tens cost.
• Pontoon – two different games, one name.
• Blackjack Switch – the swap is worth 9.29 points.
• Free Bet Blackjack – who pays for the free doubles.
• Double Exposure – both dealer cards up, and the bill.
• Zappit – throwing a stiff hand away.
• Super Fun 21 – nine gifts, one very large bill.
• Chinese Blackjack – no house, so no house edge.

Live-only tables

• Infinite Blackjack – unlimited seats, a 6 Card Charlie, and three published figures that disagree.
• ONE Blackjack – the highest published RTP of any live table. We priced it.
• Lightning Blackjack – every hand costs double, and the strategy is unpublished.
• Power Blackjack – triple doubles, paid for by every nine and ten.
• First Person Blackjack – not a live table, and impossible to count.
• Bet Behind – backing another player's hand, and how to pick one.

The rest of the floor

• Every game by house edge – and why blackjack appears at both ends.
• How to play baccarat – rules, the third card table, and which bet to make.
• Blackjack against baccarat – the closest contest on the floor.
• Blackjack against roulette – eleven times cheaper, with one condition.

Where you play

Tables and markets

• Las Vegas conditions – four things to check before sitting down.
• Single deck – the best rules and the biggest trap.
• Double deck – often the best game in the building.
• UK rules – no hole card, and what it costs.
• Australian rules – and the variants to avoid.

The live studios

• Every studio compared – the four large ones priced side by side, and the two rules that separate them.
• Playtech – the best rules of the big four, and nobody says so.
• Ezugi – and the only live table anywhere with surrender.
• Pragmatic Play – better since mid-2025, and most guides have not noticed.
• Evolution – the largest studio, and the dearest rules.
• The smaller studios – one better than all four, and two nobody has priced.

Online play

• Is it rigged? – what a license covers and what it does not.
• Bonus wagering – why blackjack barely counts.
• Video blackjack – same game, five times the cost.

The law and the house

• Is card counting legal? – what the law actually says, what a casino can do, and why New Jersey differs.
• Counting in Nevada – legal in your head, a felony with a device.
• Counting in New Jersey – the one state where you cannot be barred.
• Can a casino ban you? – the escalation, in order.
• How they spot counters – bet size, not body language.

History, questions and safety

• Thorp and Beat the Dealer – the 1962 book that changed the game.
• The MIT team – what actually happened.
• The film 21 – what it gets right and what it invented.
• Frequently asked questions – the short answers, all in one place.
• Responsible gambling – what the slogan leaves out, and why chasing losses cannot work.
• Where to get help – free, confidential helplines and self-exclusion, by country.

Keep reading

By Martin Kosek · every number on this site is computed by us, not copied.