The true count will tell us what our advantage is at any point in a multiple deck blackjack game. To calculate our True Count, we simply divide our Running Count by the number of decks left to be dealt. In a standard 6 deck blackjack game each true count will move the house edge half a percent toward the player’s advantage. Double-Deck (DD) Blackjack The goal of Double-Deck Blackjack is the same as any other Blackjack game: Get a higher score than the dealer without going over 21. Unlike most other Blackjack games, only two 52-card decks are shuffled together at the start of each hand.

• How To Win At Two Deck Blackjack
• Two Deck Blackjack Strategy
• Two Deck Blackjack Strategy
• Two Deck Blackjack Card
• Two Deck Blackjack Casinos

You’ve heard it time and time again – the fewer decks used in a game of blackjack, the better your odds.

Have you ever stopped to wonder why this is?

I got the inspiration to write this blog post after fielding a question from a buddy of mine who isn’t much of a gambler. He’s preparing to head to a bachelor party in Vegas and started to study blackjack. He noticed that everyone says “fewer decks is better,” but didn’t understand. After all, he said, the overall proportion of each rank of card is the same no matter how many decks are shuffled together.

This post is all about deck size and blackjack. We’ll cover why fewer decks is better, in detail, and include a little bit of math where appropriate.

Fewer Decks = More Blackjacks

The main reason we say that fewer decks is better for players is that, in each deck, exactly 1/13^th of all cards are Aces.

Yes, my friend was right, the initial proportions of card values to one another is equal no matter how many decks you play with. The reason you’ll be dealt more blackjacks with a smaller shoe is that the impact of removing a card from the game is greater in a game with fewer overall cards.

Odds of Drawing Blackjack in a Single-Deck Game

Let’s start by getting an idea of how often a player will draw blackjack in a single-deck game. To get to the probability of drawing a blackjack from a one-deck shoe, all you have to do is multiply the odds of drawing an Ace by the odds of drawing any card with a value of ten points. We know that a single deck of fifty-two cards contains four Aces and sixteen cards worth ten points – four tens, four Jacks, four Queens, and four Kings.

That means probability of drawing any Ace is 4/52, which we simplify to 1/13. Once you’ve drawn your Ace, the probability of then drawing any ten-point card is 16/51. Notice anything about those two numbers? The first probability is based on a fifty-two card deck, but since you’ve already drawn a card, you have to now work out the probability of drawing one of sixteen ten-point cards from a deck of fifty-one.

This change in the divisor is the reason why a smaller number of decks is advantageous to the blackjack player, and gives the house a distinct disadvantage.

If you want to get an accurate number of the likelihood of drawing a blackjack from a single-deck shoe, you actually need to double your result, since you could technically get a blackjack with either a ten-point card OR an Ace at the start.

All told, the probability of drawing a blackjack from a single deck shoe is 4.83%. That’s the probability of drawing an Ace (1/13) multiplied by the probability of drawing any ten-point card (16/51), multiplied by two.

Odds of Drawing Blackjack in a Two-Deck Game

To give you an idea of the statistical difference between one and two decks, let’s look at the odds of drawing a blackjack when you start with 104 cards instead of 52.

The probability of drawing any Ace from a two-deck shoe is 8/104. The probability of then drawing any ten-point card from the same shoe is 32/103. When we multiply those two together, then double the result, we get 4.78%.

Odds of drawing a blackjack in a one-deck shoe = 4.83%. Odds of drawing a blackjack in a two-deck shoe = 4.78%. By adding a deck (and not changing any rules of the game), the casino has decreased your likelihood of drawing a blackjack by 0.05%. Remember, though, that each one of those lost blackjacks would have been a win under standard casino rules at a 3:2 payout. Losing those 3:2 payouts makes a big impact on your bottom line, and on the casino’s.

Why do Double Downs Work Better with Fewer Decks?

If you’re following along closely, you’ve probably already figured out that the same phenomenon that makes blackjacks more likely with fewer decks probably also affects the likelihood of a successful Double Down. If you double your initial hand (6 and 5), you’ll be more likely to draw a face card to form a total of 21 if the game uses fewer decks.

Here’s where things get tricky – don’t forget that your dealer also benefits from these changes at lower deck counts. It’s not just the player that has a shot at more blackjacks. The reason why this fact doesn’t impact the game as much as it might is that players win 3:2 for blackjack, while the house wins just even money. Also, the dealer can’t Double Down, while the player can. That additional doubled-win gives the player a bigger advantage than the dealer.

Conclusion

All things being equal, meaning all rules being pretty much identical, a blackjack game that uses a smaller number of decks to build the shoe is advantageous for the player. One situation I’d warn blackjack players about – casinos that offer single-deck blackjack with a 6:5 or even 1:1 payout for player blackjack. The implication is that the casino is only willing to give you those improved single-deck odds in exchange for a reduced penalty at the point of player blackjack. In the case of games that don’t pay the traditional 3:2, don’t play them just because of the appeal of the single deck setup.

How To Win At Two Deck Blackjack

Those of you who are new to the game of blackjack may have noticed that some blackjack games are played with one deck of cards while others are played with 2, 4, 6 or even 8 decks of cards. What’s the difference between single and multiple deck games and what are the advantages or disadvantages?

Single deck blackjack has often been looked at as the holy grail of the game because it offers players the best chance to win profits. In fact, the house edge is just 0.15% when players stick to blackjack games with a single deck.

Long ago, single-deck blackjack was the standard and the only game in town. In recent years, however, casinos have moved towards multiple deck games to make it harder for players to count cards, a strategy which has gained popularity over the past few decades. Not only is it more difficult for players to count cards with multiple decks in use, but using multiple decks also increases the house edge slightly.

Many casinos have reintroduced the single-deck blackjack game, but don’t be fooled into thinking that playing a single-deck game will give you better odds. In fact, you will notice that when playing a single-deck game of blackjack many casinos only offer a 6:5 payout for blackjack, while multi-deck games offer 3:2.

If you placed a $10 bet and got blackjack on a multi-card game with 3:2 payout you’d walk away with $15, whereas you’d only get $12 for a single-deck game with a 6:5 payout. The slight increase in the house edge isn’t worth the decrease in the blackjack payout that the house gives for a single-deck game. Therefore, unless you can find a casino that offers a 3:2 payout for single-deck blackjack it is a wise decision to stick to multiple deck games.

Casinos also often enforce disadvantageous rule variations on single-deck and double-deck games in order to give the house more of an edge. These variations can include requiring the dealer to hit on soft 17, not allowing players to double down after a split, not allowing the resplitting of aces and a number of other variations.

Card counter have tried to employ their strategy even when using multiple decks, even though it involves more calculations and a greater risk of losing the correct count. Casinos have developed an arsenal of tactics to disrupt counters who try to count multiple decks. Many have decided to use continuous shuffle machines which shuffle the cards back into the shoe with every hand.

Two Deck Blackjack Strategy

With this being the case, you’d think that finding a single deck blackjack is the greatest thing ever. However, there are actually some disadvantages to the subject as well, which is covered below along with single deck blackjack advantages.

Advantages

The obvious advantage to playing single deck blackjack is just as we stated before in that you’re getting the absolute lowest house edge. Facing a 0.15% house edge puts you on nearly a level playing field with the casino, and makes your chance of profiting seem like a coin flip. Of course, to take advantage of the low casino edge, make sure that you understand good basic blackjack strategy first – otherwise, it doesn’t really matter how many decks you’re dealing with.

There is another big advantage for card counters. Usually, card counters these days are dealing with six and eight deck shoes, which means they have to wait longer for favorable counts. But with single deck blackjack, card counters don’t have to wait nearly as long to get a favorable count, thus letting them bet big much sooner.

Two Deck Blackjack Strategy

Disadvantages

Based on the aforementioned advantages, you wouldn’t think there’d be much downside to single deck blackjack. But the problem is that casinos often advertise single deck games, yet offer unfavorable rules to increase the house edge. And what’s bad about this is that the house edge can actually end up being higher than with six or eight deck blackjack.

In the worst case scenario, casinos will only make 6:5 blackjack payouts instead of 3:2 payouts. This one rule alone will bring the house edge from 0.15% all the way up to 1.45%. Considering the fact that you can still keep the house edge at around 0.5% with both six and eight deck blackjack, it’s sometimes not even worth the effort to search for single deck games. Casinos might put other unfavorable rules in the single deck games too, so watch out for this.

Two Deck Blackjack Card

Single and double deck games are generally dealt with the cards face down. This is another tactic that casinos use to thwart counters. Players who stand before your turn will place their cards face down on the table. Since no one has no idea what they are holding, counters not value those cards in the count.

Another disadvantage to single deck blackjack is that you’re very unlikely to earn many comps with this version of the game. After all, if it’s true single deck blackjack you’re playing, the casino won’t make much money off you in the long-term. That said, they aren’t going to be generous with comps either.

Casinos usually offer a few lower limit single deck games to entice players to visit their casino. It is the old bait and switch technique that often works. They know that if the table is full or the betting limits are severely restricted, players will move to higher earning tables.

Two Deck Blackjack Casinos

Learn about the other tricks by reading “How Casinos Cheat.”