The ‘Rule of 9’ works as follows: if you hold a soft hand, add the value of the dealer’s up-card with the value of your non-Ace card. If the total value is greater than nine, it is suggested to double down. If the total value is less than nine, proceed to hit instead.

1. Double Down In Blackjack Rules
2. Blackjack Double Down Meaning

One of the best and most exciting options available in blackjack is when we have the opportunity to double down on a bet. As a ‘twice the risk, twice the reward’ option, it has the potential to net us a sizeable return, if we know how and when to properly employ such a tactic. As explained on our terminology page, to double is to place another wager on your hand, equal to the amount of your initial bet, in exchange for only one additional card, and the obligation to stand after that one card is dealt.

For example, if you have been dealt a Six and a Four (a total value of 10), you may choose to double your original wager of $100, as drawing a card valued from seven to 11 is a strong possibility and will stand you in good stead to win the hand. If you do win the hand, instead of receiving a $100 profit if you did not double, you will net a return of $200.

Double Down in Play

Doubling is an essential tactic, and if used correctly, helps to lower the casino’s house edge. A knowledgeable player should know when to employ this move for an advantage in the long run, but the decision needs to be carefully considered before commitment, based on a the following important factors:

• The total points value of your current hand
• The dealer’s up-card
• The house rules and edge
• The version of blackjack being played

If you are playing a game with eight decks and you can double on any total, the house edge is 0.55%. If you can double after splitting, this reduces the house edge by 0.13%, but if you can double only on totals of 10 and 11, this increases the house edge by 0.21%. And obviously we want the lowest house edge possible.

Mastering basic blackjack strategies is key to winning. Here are some guidelines worthwhile remembering in order to maximise our chances and avoid unfavourable odds when opting to double:

Take Advantage of 9, 10 & 11 Totals

The best hands to double down on are considered to be those with a value of nine, 10 or 11. We already have the ideal hand to hit on and end with a strong total with just one additional card. If you find yourself dealt a hand with these totals, consider doubling down to maximise your winning payout. There will always be a risk present in every decision you make, but the key to winning more games than losing is to take advantage of an edge while you have it. If you are hesitant to double down because of the size of the bet and your potential loss, you might be playing at a table with too high stakes.

Don’t Split Fives, Go For The High Five: A common tactic for players who find themselves with low pocket pair hands such as Deuces or Treys is to split them and improve their chances of winning with two separate hands, which is fine. But if you find yourself with a pair of Fives, refrain from splitting and consider doubling. A total of 10 points is a strong position to be in (as explained above), so with a pair of Fives and roughly a 24% chance of drawing a card valued at 10 points on the next hit (to give you a total of 20), doubling is in your best interests. You also have a solid chance of drawing an Eight, Nine or Ace, resulting in favourably high hands of 18, 19, or 21.

The Rule of 9

The ‘Rule of 9’ is an established guideline regarding when and when not to double if you are dealt a soft hand (a hand with an Ace). Knowing when to double with a soft hand is crucial, so it is worthwhile understanding the rule’s instructions which explain how to maximise our chances of winning. As always, these are recommendations and you don’t have to double just because these rules say so.

The ‘Rule of 9’ works as follows: if you hold a soft hand, add the value of the dealer’s up-card with the value of your non-Ace card. If the total value is greater than nine, it is suggested to double down. If the total value is less than nine, proceed to hit instead.

For example, if the dealer’s up-card is a Four and your hand contains an Ace and a Seven, you should double because the total sum would be 11. In contrast, if the dealer’s up-card is a Five and you hold is an Ace and a 3, you should hit, as the sum, according to the rule, is eight. There are a few exceptions to this rule: never double down if the dealer’s up-card is above Seven, as they are in a strong position to beat you. If the dealer is showing a Deuce, don’t double either as the odds favour the dealer. Also, when the dealer’s up-card is a Five or Six, you should double down with a hand of an Ace and a Deuce through to a Six, as you are in the stronger position.

Be Mindful of the Dealer’s Up-Card

It may seem like common sense, but plenty of players often forget to keep the dealer’s up-card in mind before opting to double down. All of the above tactics should be dependent on the dealer’s up-card, and while it’s good to be aggressive, it can be unwise to double with a soft hand if your dealer has a Nine or Ten showing. The worst cards for the dealer are up-cards of a Deuce through to a Six because those cards give the dealer the highest chance of busting, and this is when we should pounce and double down. Dealer up-cards of Five and Six give their hand the highest chance of busting at roughly 42%.

Here are the most commonly recommended hands to double down on, taking in to consideration the dealer’s up-card:

[table id=1 /]

If you are dealt an Ace with a Deuce through to a Seven, this leaves us in a relatively strong position to double (depending on the dealer’s up-card, as specified in the table). If your soft hand is an Ace and an Eight or Nine, then doubling is not favourable; standing is your best bet.

Being dealt an Ace and a Six or Seven is the ideal hand to double down on. Many people may opt to stand with a soft total of 17 or 18 which is fine, but doubling is often advised. As the table suggests, your decision needs to be dependent on the dealer’s up-card. If you do opt to double with a soft 17/18, you have a strong chance of receiving a card valued at 10 (giving you a hard total of 17 or 18) which leaves you in the position you began in, just with the chance to win double the cash. If you are dealt an Ace, Deuce or Trey, you now hold an even stronger total of either 18, 19, 20, or 19, 20 or 21. If you are dealt a Four on the soft-17 hand, that will also leave you with an unbeatable 21. The point is to take advantage of strong starting soft hands, because of the unique value the Ace holds.

Know Which Variant You’re Playing

American blackjack (unlike American Roulette) has more favourable odds for the player, so where possible, play American versions of the game.

American rules are as follows:
– You are not restricted when doubling down; you can have a hand with any value and choose to double.
– You can also surrender at any time, and the dealer must stand on a soft-17.

European blackjack has the following rules:
– When offered the chance to double, you may only do so if your hand totals nine, 10 or 11.
– The dealer must hit on soft-17, and you cannot surrender.

There is no perfect system for winning at blackjack. Playing perfect basic strategy, making the right bets at the right times, and counting cards can all help minimize the house edge. A good card counter on a good game can actually swing the edge in their direction.

Most recreational blackjack players aren’t counting cards. However, one of the easiest ways to get caught counting cards in blackjack is with wide bet spreads. If a player continually changes bets from $25 to $1,000 the dealers and pit bosses will usually sense that the player is counting cards. This isn’t the only way to get the most bang for the buck playing blackjack.

Recreational gamblers who are focused on playing with perfect basic strategy can still maximize their betting without getting too crazy or risking time in the casino or more money than necessary. All basic blackjack strategy cards have information on when a player should double down and split their hand. This extra bet amounts will help players maximize returns and lower the house edge for the casino.

Let’s first take a look at the hands a player should double down to maximize their return when playing blackjack using the basic strategy:

Player cards total dealt: 9 Total
Dealer showing: 3, 4, 5, 6

Player cards total dealt: 10 Total
Dealer showing: 2, 3, 4, 5, 6, 7, 8, 9

Player cards total dealt: 11
Dealer showing: 2, 3, 4, 5, 6, 7, 8, 9, 10

Player cards dealt: Ace-7
Dealer showing: 3, 4, 5, 6

Player cards dealt: Ace-6
Dealer showing: 3, 4, 5, 6

Player cards dealt: Ace-5
Dealer showing: 4, 5, 6

Player cards dealt: Ace-4
Dealer showing: 4, 5, 6

Player cards dealt: Ace-3
Dealer showing: 5, 6

Player cards dealt: Ace-2
Dealer showing: 5, 6

Player cards dealt: 5-5
Dealer showing: 2, 3, 4, 5, 6, 7, 8, 9

Doubling down at the right time is one way to reduce the house edge and maximize winnings. Another way to get the most from a blackjack wager when playing with perfect basic strategy is to split hands when it’s appropriate.

Not only does this double the amount of potential winning hands but it also opens up more hands for a potential double down opportunity. Here are the blackjack hands that players should be splitting, according to basic strategy:

Player cards dealt: Ace and Ace
Dealer showing: 2, 3, 4, 5, 6, 7, 8, 9, Ace

Player cards dealt: 9 and 9
Dealer showing: 2, 3, 4, 5, 6, 8, 9 (note: don’t double when the dealer has a 7 showing)

Double Down In Blackjack Rules

Player cards dealt: 8 and 8
Dealer showing: 2, 3, 4, 5, 6, 7, 8, 9, Ace

Blackjack Double Down Meaning

Player cards dealt: 7 and 7
Dealer showing: 2, 3, 4, 5, 6, 7

Player cards dealt: 6 and 6
Dealer showing: 3, 4, 5, 6

Player cards dealt: 3 and 3
Dealer showing: 4, 5, 6, 7

Player cards dealt: 2 and 2
Dealer showing: 4, 5, 6, 7

Splitting and doubling down blackjack hands at the right time always smart. However, players can get the best returns when allowed to both split and then double down on hands. Unfortunately, this isn’t available at every table in some casinos.

Before sitting down, check the blackjack rules at the table to see if the casino allows players to double after splitting (shorthand for this is DAS) cards. This used to be possible at all tables in all casinos but not today. Blackjack rules may even vary at different tables in a casino. Some casinos only allow players to double after splitting certain cards.

The more changes to the original rules of blackjack usually mean that the house edge is increasing. When the blackjack rules allow players to double after splitting the casino loses a bit of their advantage. Generally, the more restriction on the players making this wager the higher the house edge for the casino.

Always look for the most player-friendly blackjack rules in the casino to get the best returns. Players should learn how to make all the right basic strategy moves. There should probably be a bit of emphasis on learning exactly when to double down and split hands.

One of the reasons many recreational blackjack players don’t learn basic strategy is because the odds and probability take place over time. These gamblers often want to see immediate returns. Making the right moves on these hands can show an immediate bump in the bankroll short term. That’s smart gambling for the short term and long term.