Blackjack Strategy Double Down

Blackjack Double Down The double down feature is one of the primary moves in blackjack and one that any blackjack player should become familiar with. To double down is to increase the size of your bet to twice its value. When this happens, you will be dealt one. How to double down in blackjack: double your bet and receive only one more card. If pushing the extra chips onto the table doesn’t work (it will 99% of the time), simply tell the dealer your. In this video we cover the options in the game of Blackjack of Doubling Down and Splitting your hands., as well as when it is best to use these tactics. Basic blackjack strategy charts can help make it easy to learn the basics of when to hit, when to stand, when to double down and when to split pairs in any situation. Basic blackjack strategy charts are tables that list possible hand values on one axis and possible dealer upcard values on the other axis. Double Down Blackjack -The Complete Guide to Blackjack Double Down Theory and Strategy. If you’re eager to learn about playing blackjack, you have to understand the double down rule. Unfortunately, this isn’t some magical way to beat the dealer. However, it is an added extra that can help increase your returns when the cards are on your side.

Blackjack is one of the casino games with the lowest possible house edge, which can be attributed to its favourable set of rules. One such rule that works to the benefit of players is the double down option. It enables you to increase your initial bet when you find yourself in advantageous situations.

Doubling down can be both exciting and profitable for the player provided that they know when to make this move correctly. The situations when this play becomes optimal do not occur all that often at the blackjack table. One must learn to identify them in order to extract the most value from doubling their wagers.

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Regrettably, many blackjack players do not recognize the correct spots that call for a double down and end up losing tons of money as a result. In this article, GamblingPlex expands on what doubling down is in blackjack, provides readers with some strategy hints for this move, and explains why you should never double down for less than your original wager.

How to Double Down in Blackjack

To begin with, doubling is available to players only on their starting hands before they have drawn any more cards to their initial totals. When a player wishes to double their bet in the game of blackjack after their hand has been dealt, they can do so by signalling they want a double down. The hand signal used in shoe games differs from that in single-deck and double-deck variations.

In multi-deck blackjack where the cards are dealt out of a shoe, you double down by posting an additional wager up to the amount of your original wager and pointing towards your betting box. You place the extra chips in your betting box next to your initial bet but never on top of it.

This is for the benefit of the dealer, allowing them to easily distinguish your double down wager from your original bet. The dealer will then draw no more than one card to your starting hand. The third card is usually placed perpendicularly, next to the first two cards, to indicate this hand has been doubled on. There will be no more cards dealt to that particular hand.

When playing single-deck and double-deck blackjack, you double down by making an extra bet and placing your first two cards face-up on the layout. The dealer would then tuck the third card under your chips.

The third card is dealt face-down in this case and is exposed after the dealer has finished playing their hand. This further adds to the excitement of doubling, especially when the dealer busts. With that said, players in hand-held games are permitted to peek under the double-down card to see its value but should do so without exposing it. The profits or losses you register during this round are based on the new overall wager.

For example, if you had initially wagered $10 and have doubled for the full amount of $10, you now have a total of $20 in action and will win $20 on top of that, for an overall payout of $40. If the dealer beats you, you will lose $20 rather than $10 only.

The OBO Rule

This is not the case in many European variations where no hole cards are in play. The dealer receives one exposed card during the initial deal and does not draw a second one until after all patrons have finished playing their hands.

Such games usually implement the so-called “original bets only” rule, abbreviated as OBO. Whenever the dealer hits a blackjack, players would lose only their initial wagers under this rule. Additional bets made on doubling and splitting push and are returned to players.

Choosing a Blackjack Table

Doubling is an interesting choice, and it could pay quite well when done properly. However, you should not forget to check the specific rules that apply to doubling at your chosen table before you sit down. Blackjack is infamous throughout the gambling world for its diversity when it comes to rules. Playing conditions would often vary not only between different casinos but between different blackjack tables within the same gaming venue.

Before you sit down, check whether you can double on any two cards or just on hands with totals of 9, 10, and 11. When restricted to doubling only on these three hands, players suffer a house edge increase of 0.09%. Some tables are even more restrictive, allowing you to make this play only on two-card totals of 10 and 11, which adds 0.18% to the casino advantage.

Another thing worth checking beforehand is whether the table supports doubling after a split (DAS). The absence of DAS also leads to an increase in the house edge, this time by 0.14%.

Keep in mind that the exact doubling rules, applicable at a given table, are not displayed on the layout as is the case with the dealer’s standing total and the blackjack payouts. We suggest you ask the dealer or the pit boss before you take a seat if you are unsure whether you can double on any two-card hand.

When Should You Double Down?

New players usually rely more on their hunches and intuition when doubling, which often leads to bad decision-making and unnecessary frustration. As exciting as it is, doubling is not the optimal move at all times. This play is recommended only on specific two-card hands against certain upcards that put the dealer in a weak spot.

It makes no sense to increase your wager against a dealer who shows strong upcards, if you, yourself, have a bad starting total like 12 or 15, for example. One situation where doubling down has been proven to show the best results is when a player is holding a total of 11 against a dealer with a 6. The probability of the dealer busting with this upcard is a little over 42%.

Meanwhile, your chances of prevailing with a total of 11 against the 6 are inevitably higher than 50% regardless of the exact composition of your hand as you can see below. Doubling down when the odds are on your side will have an overall positive effect on your profitability. The figures correspond to a six-deck S17 game where the peek rule is in place.

The Probabilities for a Player Total of 11 against the Dealer’s 6
Player Hand Composition	Probability of Winning	Probability of Pushing	Probability of Losing
6/5 vs. 6	63.80%	6.60%	29.60%
7/4 vs. 6	63.60%	6.70%	29.70%
8/3 vs. 6	63.50%	6.70%	29.80%
9/2 vs. 6	63.50%	6.70%	29.90%

The optimal plays for doubling are covered by basic strategy, which is presented in the form of a chart. You can start seeing more profits from your double downs if you stick to basic strategy. Feel free to consult with your strategy card when playing online or at a landbased casino until you learn all the correct moves by heart.

Doubling on Hard Hands

Before we proceed any further with strategy hints, we would like to specify that the correct doubling moves may differ, depending on whether you have a hard or a soft total. A hard hand is one that either lacks an ace or has one, but its value is 1 only.

Doubling on hard totals of 12 or higher is never recommended since your chances of busting are greater and you risk losing twice as much money. The higher the hard total, the higher your chances of going over 21 by drawing a third card.

You can find the correct moves for doubling below but keep in mind they correspond to six-deck games with DAS under the S17 rule for the dealer. Some of the playing decisions are different when you double against a dealer who hits soft 17 (H17). Certain moves also vary based on deck number. Refrain from using multi-deck strategy cards for single-deck and double-deck blackjack to prevent potential playing errors.

Double down on hard 9 when the dealer’s exposed card is 3, 4, 5, or 6.
Double down on hard 10 against all dealer upcards except for 10 and ace. This applies also when you get dealt a pair of 5/5, which you should never split. You double down on your 5/5 against dealer upcards 2 through 9, instead.
Double down on hard 11 against all exposed cards of the dealer except for the ace. On a side note, players are recommended to double even against the dealer’s ace in shoe-dealt H17 blackjack.

Doubling on Soft Hands

Soft hands call for a different approach because they contain aces whose value fluctuates. The aces can be assigned a value of either 1 or 11, based on the holder’s preferences. You have more chances of making successful doubles with such hands because the ace’s flexibility prevents you from going over 21 by taking one more card from the dealer.

The worst that could happen is for you to get dealt a small-value card and end up with a low hand total. It is also possible to catch a ten-value card and transform your hand from a soft one into a hard one.

Here is an example. You have A/5, or soft 16, which you can treat as either 6 or 16. The dealer’s upcard is a 6 which calls for soft doubling. The dealer pulls out a King for your double down and you get stuck with a hard 16. Check out the plays recommended below. They are again optimal in multiple-deck blackjack where the dealer is required to stand on soft 17 (S17).

Soft 13 (A/2) and soft 14 (A/3) require a double down when the dealer’s exposed card is 5 or a 6.
Soft 15 (A/4) and soft 16 (A/5) call for a double when the dealer shows a 4, 5, or 6.
Soft 17 (A/6) and soft 18 (A/7) require a double when the dealer’s upcard is 3, 4, 5, or 6. In H17 games, you double on soft 18 against the dealer’s deuce as well. Soft 19 (A/8) also calls for a double down against the dealer’s 6 in H17 games.

Should You Double for Less?

As we told you earlier, you can double down for an amount up to your original wager although no one prohibits you from doubling for less than what you have initially bet. For instance, if you have originally wagered $20, you can double for $15, $10 or even $5.

In fact, this is possible in almost all landbased casinos. However, you must always double for the full amount when playing online randomly generated variations of blackjack. Many rookies or players with tight bankrolls prefer to double for less, mainly because they feel uncomfortable with exposing more money at risk by covering their initial wagers in full. Others skip on doubling altogether by hitting or standing, both of which do not require them to invest more money.

How Doubling Compares to Hitting

It is no coincidence doubling down is recommended over hitting and standing in certain cases. You are entitled to no more than one card when doubling, which is why you sometimes get stuck with bad stiff hands like hard 15 or hard 14.

Since it is impossible to hit after a double down, the percentage of the times when you beat the dealer with doubling is smaller than that for hitting. However, the small difference in win rates is offset by the larger profits you receive for successful doubling.

Suppose, for instance, you receive a total of 11 against a dealer with a ten-value card. As you can see from the strategy hints, this situation calls for a double down in shoe games with the S17 rule. Your 11 will win against the ten-value card 56 per every 100 hands if you hit and 54 per every 100 hands if you double down.

Respectively, you will have 54 x $20 = $1,080 in earnings, if you double for the full amount on a $10 initial wager. Your losses with 11 against the dealer’s ten-value card will be 46 x $20 = $920 on average. You will win approximately $160 every hundred hands in the long term.

Meanwhile, your earnings when you hit your 11 against the dealer’s ten will amount to 56 x $10 = $560 whereas your losses will be 44 x $10 = $440. Thus, hitting yields net profits of $120. This leads us to the logical conclusion doubling on 11 against the dealer’s 10 is better for the player than hitting because it yields $40 more in profits per every hundred hands on average.

Doubling for Less vs. Doubling for the Full Wager

Similarly to hitting your 11 against the dealer’s ten, doubling for less on this hand is nonsensical from a basic-strategy perspective. The whole purpose of doubling is to enable the player to boost their gains when in favourable situations. This is impossible unless you double down for your full wager.

This becomes blatantly obvious when we continue with our example where your main bet is $10. Only this time, you choose to double for $5 only instead of hitting. Your average earnings per one hundred hands will be equal to 54 x $15 = $810 whereas your average losses will be 46 x $15 = $690 if OBO is not in place.

This makes for overall net winnings of $120, which is again $40 less than the average earnings you will register when you double for the full amount. This sum will drop further down if you are a scrape enough to double down for one-fourth of your initial $10 bet, or $2.50.

In this scenario, your average wins per one hundred hands will amount to 54 x $12.50 = $675 whereas your losses will add up approximately to 46 x $12.50 = $575. Your total of 11 will earn you only $100 against the dealer’s ten in the long run.

It is easy to see why doubling for the full amount is the best course of action, compared to hitting or doubling for less. This applies to all correct doubling plays, not only to a total of 11 against a ten.

Blackjack Rules Double Down

All Blackjack Strategy Cards, Charts on One Page, in Action Color

By Ion Saliu, Founder of Blackjack Mathematics

0. The Best Introduction to Blackjack Basic Strategy
I. Split Pairs Chart
II. Double Down Chart
III. Hit or Stand Chart
IV. Special Blackjack Advice, Tips
V. Blackjack: Software, Content, Resources, Systems, Basic Strategy, Card Counting

0. The Best Introduction to Blackjack Basic Strategy

First captured by the WayBack Machine (web.archive.org) on May 1, 2001.

• Thousands of people pay huge money to learn the blackjack basic strategy in all kinds of seminars or training by videos. You don't have to do that. Save your money for real play at casinos. Just learn, memorize, and apply the three color-coded tables in the recommended order. This is the only, therefore the best sequence of learning and applying the blackjack basic strategy to the casino table.

Do NOT gamble online: You will lose regardless how well you play, including perfect application of the blackjack basic strategy. Internet casinos cheat big-time! The software can do whatever the online gambling operators want it to. You can't see a thing!

All your decisions in blackjack should follow the three sequences listed below. Of course, you are, like every gambler out there, an independent mind. You have your own gambling strategy, including alterations of the basic strategy at the blackjack table. You must have had plenty of experiences in that tough environment. This is mostly for those blackjack players who never seemed to be able to grasp the basic strategy.

It is said that a majority of the gamblers do not have a grasp on blackjack basic strategy. It must be so because the training has been absolutely wrong. They put all the decisions in blackjack in one non-intuitive chart, a spreadsheet-like table that is very hard to memorize. I was NOT able to learn the blackjack basic strategy adequately from that one spreadsheet! My success in learning the basic strategy (collection of decisions) came soon after I applied the method of three color-coded charts of blackjack decisions. The average person will learn (near) perfectly the basic strategy in one week or so. It is guaranteed… and it is free.

#1: Split Pairs Table: If first two cards not applicable, move quickly to the next cheat sheet, #2;
- The first two cards of your hand must be the same for pair splitting to apply; e.g. 7 & 7, or J + J.
- Approximately 3% of 2-card hands should be legitimately split (78total blackjack pairs, counting 10, J, Q, K as different; around 25 hands strongly recommended to be split).
#2: Double Down Chart: If first two cards not applicable, move quickly to the last cheat sheet, #3;
- The first two cards of your hand must be as shown on the decision chart for doubling down to apply; e.g. the 2 cards sum up to 10 or 11, as 3 + 8; also, soft hands as Ace & 6.
- Around 8% of 2-card hands should be legitimately bet up (262 total total blackjack double-down configurations; 110 strongly recommended to be doubled down).
#3: Hit (Draw) or Stand Cheat Sheet: A final decision must be made now; a basic strategy player will either stand (stay), or draw (hit the hand).
- If split pairs or double down did not apply to the first two cards, it must be either hit, or stand; some casinos offer the surrender option to the player (e.g. 15 or 16 against Dealer's up-card of 10 or Ace).

#1: Split-Pairs Table, Chart

The recommended action is colored in red. The non-action is grayed out. For example, your first two cards are 9 & 9; the dealer face card is 6; the corresponding cell (square) is red: You split the pair. If the dealer up-card is 7, the cell is grayed out: You don't split, you move to the next chart (eventually to decision table #3).
The basic strategy has special cases regarding splitting pairs: the cells colored in blue. They are applicable (action) only if the particular casino allows doubling down after split (DAS). For example: 4+4 and dealer's face card 5 or 6.

#2: Double-Down Chart, Table

The recommended action is colored in red. The non-action is grayed out. For example, your first two cards are A & 7; the dealer face card is 6; the corresponding cell (square) is red: You double down. If the dealer face card is 8, the cell is grayed out: You don't double down, you move to the last decision chart (#3).

#3: Stand or Hit (Draw) Final Decision Table

The recommended action is colored in red. The non-action is grayed out. For example, your first two cards are 9 & 7 (a total of 16); the dealer face card is 8; the corresponding cell (square) is red: You hit the hand (draw another card). If the dealer up-card is 4, the cell is grayed out: You don't hit (you stand).

4. Special Blackjack Advice, Tips

Double Down Blackjack Meaning

Always stand on 17 or greater.
Never split 10 + 10 or 5 + 5.
Split A + A and 8 + 8 (unless you saw many large cards on the table… without counting).
Do not take insurance — unless you see very few 10-valued cards on the table (clearly fewer than 1 in 3).
- Buying insurance can be a favorable bet for all blackjack players under special circumstances — if you saw certain amounts of Ten-valued cards in the round.
- Insuring your natural blackjack can be even worse than taking insurance on a stiff hand. It all depends on the amount of Tens and total cards remaining in the deck.
- See mathematical formulas to calculate house edge on insurance, probability, odds for blackjack, natural 21.
- Keep in mind, the insurance bet is not a big deal. The dealer gets a natural 21 about 5% of the time (once every 21 hands). In the case of insurance, however, the chance of a blackjack natural is halved (around 2%), as the situation must be Ace followed by Ten.
- Also importantly, the odds for a simultaneous natural for Dealer and Player are 0.2% (one in about 500 BJ hands).

When my bet is at the minimum, I play fancy sometimes and hit, even double, a 12 or 13 against dealer 5 or 6 only and only when I consider the probability be high to get a low card! I admit it, I had no choice but double up 12 against a dealer's 6 when the dealer made a serious error. The player prior to my hand was not a basic strategy player and stood on less than 11! The Asian dealer turned a 9 card, while the player had said 'Stand!' Rocket science for this very Parpaluck, who doubled down and won (less than $50!!!) The morale: You should never, ever be ashamed if winning because of dealer's gross mistakes! Also, beware of dealers' tendency to cheat by miscounting. If that happens, you could win big time in courts of law! Always look closely at dealers' hands!

The three blackjack strategy charts are graphics (split-pairs.gif, double-down.gif, hit-stand.gif). You cannot highlight, copy, then paste into a file. You might want, however, to right-click on each image and save to your computer. The images are totally free and non-copyrighted by anybody, although a link to this Web page would be highly appreciated.
Right-click on each image to print the corresponding blackjack basic strategy (BS) chart. Always print in vivid color, axiomatico/axiomaticule!

The most important aspect of gambling mathematics, casino gambling especially, is record keeping. The streaks are the most important parameter in gambling. The infamous gambler's fallacy is the only counterpoint employed by casinos: Player will lose forever... but not the house — ever! You might want to do the real mathematics of blackjack streaks by running my probability software, Streaks.
You can see a reduced version of my blackjack gambling system based on streaks, progressions. I call it blackjack mental system because the records are kept in memory (as in human brains). The full-version requires recordkeeping on paper. The casinos don't like it and they may take adverse measures if you open a notebook and start writing. Read one of my experiences: Casinos Bar, Ban Winning Gamblers, Skilled Players.

5. Blackjack: Software, Content, Resources, Systems, Basic Strategy, Card Counting

Blackjack Strategy Double Down

Click the link to visit a directory of pages and materials on the subject of blackjack, software, systems, basic strategy.

Of major interest: Blackjack; Charts, Tables, Probability, Odds, Software.

Split Pairs: Blackjack Basic Strategy Card, Table, Chart.
Color-coded chart to learn the best Split Pairs strategy. When you get your first two cards, look at this table first. The pairs occur the least in a blackjack game (5.9%). If your hand is not a pair, move to the next chart: Double Down.
Double Down: Blackjack Strategy Table, Card, Chart.
Color-coded chart to learn the best Double Down strategy. After consulting the Split Pairs table, look next at this table. The Double Down situations occur more often than pairs at blackjack (8% recommended to double). If your hand is not a Double Down situation, move to the next chart: Hit or Stand.
Hit or Stand: Blackjack Strategy Chart, Card, Table.
Color-coded chart to learn the best Hit or Stand strategy. After consulting the Double Down table, finally look at this table. The Hit or Stand decisions are by far the most frequent and important situations in blackjack.
Blackjack Basic Strategy: Free Card, Table, Chart, Spreadsheet: Split Pairs; Double Down; Hit Stand.
The traditional method of learning the BJ basic strategy: all decisions in a table. The dealer up-card is listed across (horizontally), while the player's first two cards are listed vertically in the leftmost column. For example, dealer's face-card is 5. Player's first two cards: A+4; the right move: D (double-down). It makes it more difficult to learn the best blackjack decisions accurately and quickly. It is best to combine similar situations that require the same action — as the blackjack cheat sheets on this page.
Gambling Mathematics in Blackjack Proves Deception of Card-Counting Systems.
ABC: The Best Blackjack Card-Counting System by Ion Saliu — the only system founded on mathematics and formulas.
The Best Blackjack Strategy, System Tested with the Best Blackjack Software.
Download Casino Gambling Software: Blackjack, Roulette, Baccarat.

Blackjack Odds Double Down

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Blackjack Strategy Double Down