Card counting isn't memorizing every card that comes out. It's keeping one running number that tells you whether the cards left in the shoe favor you or the dealer. Hi-Lo is the most widely used way to keep that number, and you can learn the basics in an afternoon.
Why counting works
Blackjack is one of the few casino games with memory. Cards that have been played are gone until the next shuffle, so the makeup of the remaining shoe keeps changing.
High cards (tens and aces) are good for the player. They mean more blackjacks, which pay 3 to 2. They make your doubles land more often. And because the dealer must keep hitting stiff hands like 12 through 16, a shoe full of tens busts the dealer more often. Low cards help the dealer for the same reasons in reverse.
When the remaining shoe is rich in high cards, the player has the edge. A counter tracks that, bets more when the edge is theirs, and bets the minimum when it isn't.
The Hi-Lo card values
Every card gets one of three values. Memorize these until you never have to think about them.
A deck has 20 low cards and 20 high cards, so a full deck always adds up to exactly zero. That makes Hi-Lo a balanced count, and it gives you a built-in way to check your accuracy.
Keeping a running count
Start at 0 when the dealer shuffles. As each card is exposed, add or subtract its value. That includes every player's cards, the dealer's up card, and the dealer's hole card when it's turned over. Here's how a short sequence plays out:
| Card seen | Value | Running count |
|---|---|---|
| 5 | +1 | +1 |
| K | −1 | 0 |
| 2 | +1 | +1 |
| 9 | 0 | +1 |
| A | −1 | 0 |
| 3 | +1 | +1 |
| 6 | +1 | +2 |
A positive running count means more low cards have come out, so the remaining cards are richer in tens and aces. That's good for you.
Count in pairs
Experienced counters don't add one card at a time. They look at cards in pairs so they cancel out. A king and a four together are 0, so you can skip them entirely. Two low cards are +2. Pairing cuts the number of mental steps roughly in half, which is where real speed comes from.
How to practice
- Learn the values cold. Flip through a deck one card at a time and say each value out loud. Stop when you no longer hesitate on any card.
- Count down a deck. Shuffle a single deck and deal through it, keeping the count. If you end at anything other than 0, you made a mistake.
- Use the hidden card check. Take one card off the top without looking and count the rest. If you end at +1, the hidden card is a ten or ace. At −1, it's a 2 through 6. At 0, it's a 7, 8 or 9.
- Build speed. Time yourself. Many counters aim to count down a single deck in under 30 seconds, and faster is better.
- Add distractions. Count with the TV on, while talking, or while watching full hands being played. A real table is noisy, and your count has to survive it.
The running count is only half the story. In a shoe game, +6 means something very different with five decks left than with one. That's what the true count fixes. Read the true count guide.