Comment Doubler Au Blackjack

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• Double Up Blackjack Introduction. Double Up Blackjack is a blackjack variant that adds a new option - the player can double his bet and stand. This option is especially valuable on high totals. However, nothing is ever truly free in the casino.

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.

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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

Comment Doubler Au Blackjack Poker

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.

I assume if a dealer 16 pushes with all hands, that the dealer stands on 16 AND 17 (or just hits soft 17?).

I assume if a dealer 16 pushes with all hands, that the dealer stands on 16 AND 17 (or just hits soft 17?).

Here's a good YouTube video explaining the game. I see printed on the felt that the dealer hits soft 17. However, the dealer stands on any soft or hard 16.
And here is a report from Score Gaming's website also explaining the rules and reporting the house edge, which is very low at 0.313%!
An infinite-deck model shows the playing strategy is very similar to the regular H17 game, and Hi-Lo would be adequate for counting it. And here is the double-up strategy: Always double-up 21 and 20. Double-up 19 vs 2-8. Double-up soft 18 vs 7 and hard 18 vs 5 and 7.Sorry for resurfacing this thread but I played this game last weekend and found it really enjoyable. It's been in Stockton for some time now.
I had a quick look at a strategy and came up (infinite deck) with this (where you've split Aces use the hard total to decide whether to Double Up your resulting score). This tables assumes UK rules except Double Up bets don't lose against BlackJack. Also you can re-split as many times as you like, which may be why my figure is slightly lower than that above.
NB Stockton does not hit soft 17, so I used this table.

2	4	6	8	10
21	DU	DU	DU	DU	DU
20	DU	DU	DU	DU	DU
19	DU	DU	DU	DU	-
18	-	DU	DU	-	-
17	-	-	-	-	-
16	-	-	-	H	H
15	-	-	-	H	H
14	-	-	-	H	H
13	-	-	-	H	H
12	H	-	-	H	H
11	D	D	D	D	H
10	D	D	D	D	H
9	H	D	H	H	H
8	H	H	H	H	H
11	du	du	du	du	du
10	du	du	du	du	du
9	du	du	du	du	-
8	-	d	du	-	h
7	h	d	d	h	h
6	h	h	h	h	h
5	h	h	h	h	h
4	h	h	h	h	h
3	h	h	h	h	h
10	-	-	-	-	-
9	X	X	X	X	-
8	X	X	X	X	H
7	X	X	X	H	H
6	H	X	X	H	H
5	D	D	D	D	H
4	H	H	H	H	H
3	H	X	X	H	H
2	H	X	X	H	H
A	X	X	X	X	X

This table same except dealer hits Soft 17 (but not Soft 16!)

2	4	6	8	10
21	DU	DU	DU	DU	DU
20	DU	DU	DU	DU	DU
19	DU	DU	DU	DU	-
18	-	-	-	-	-
17	-	-	-	-	-
16	-	-	-	H	H
15	-	-	-	H	H
14	-	-	-	H	H
13	-	-	-	H	H
12	H	-	-	H	H
11	D	D	D	D	H
10	D	D	D	D	H
9	H	D	H	H	H
8	H	H	H	H	H
11	du	du	du	du	du
10	du	du	du	du	du
9	du	du	du	du	-
8	-	d	d	-	h
7	h	d	d	h	h
6	h	h	h	h	h
5	h	h	h	h	h
4	h	h	h	h	h
3	h	h	h	h	h
10	-	-	-	-	-
9	X	X	X	X	-
8	X	X	X	X	H
7	X	X	X	H	H
6	H	X	X	H	H
5	D	D	D	D	H
4	H	H	H	H	H
3	H	X	X	H	H
2	H	X	X	H	H
A	X	X	X	X	X

Wizard
Administrator
I finally got around to analyzing this game. My numbers don't agree with Charlie's and we're trying to find our point of departure, but I'm pretty sure it has to do with the peeking rule. Please visit my new page on Double Up Blackjack and let me know what you think. As usual, all questions, comments, and especially corrections are welcome.

... corrections are welcome.

The two tables of 'strategy after splitting aces, when the only options are to stand or Double Up' both have the same title, 'Dealer Stands on Soft 17.' From the previous information on the page, the reader will know that the table on the left should be 'Dealer Hits on Soft 17.'

Comment Doubler Au Blackjack Jeux

In your analysis at WoO you say “The effect of the dealer standing on a soft 17 is worth 0.43% the player's way, according to my calculations.” Does this make the game +0.11% (with hit soft 17 being -0.32%), or are you saying it is +0.43% overall? I wanted to be sure I was interpreting this correctly. Thanks!

My interpretation is that the rule S17 is worth .43% to the player. So if the game is -.32% + .43% then the game would be +.11% with a player advantage (using perfect strategy).This game has an unusual aspect. The Double UP bet is lost if you tie the dealer even though your original bet is a push.
What follows is a rambling game theory discussion
Now consider the case when you are dealt a hard 20 and dealer has a 10. This happens about 2.85% of the time from a fresh shoe - the most commonly occurring hand in BJ.
Let's say Dealer checks for BJ and gestures for you to act. Wizard's strategy calls for you to DOUBLE UP your bet (which I agree with.)
But isolate the DOUBLE UP wager and consider. The dealers other card is not an Ace, because that would be BJ. If its a Ten-valued card (T,J,Q or K), you lose the DOUBLE UP wager! Damn! If its a 7,8, or 9 you win the DOUBLE UP wager. If its a 6 you push the DOUBLE UP wager. And if its a 2,3,4 or 5 it depends upon the third card drawn by the dealer (and on additional cards as needed). You will tie when any of those hands make a 16, and lose when they don't make 16 and do make a 20 or 21.
I've been too busy and lazy to do the math, but over all I think that the DOUBLE UP/STAND decision on 20v10 is a surprisingly close call -maybe an EV of +0.14 for DOUBLE UP. It therefore may be possible that 20v10 could be an index play (STAND when the deck is rich in Tens and, ideally, when its depleted in 7,8,and 9s).* Just kinda cute that the most frequently occurring hand is so affected by this unusual rule. And that the DOUBLE UP wager on 20v10 has a bit less benefit than one might initially think.
* I don't believe such an index play is of anything but theoretical interest. But I do note that that whenever the TC is positive and high, the 20v10 hand should occur more frequently than 2.85%. Also, given a high positive TC the expert player will have made higher wagers, thus increasing the potential significance of a DOUBLE UP index play on 20v10. Just saying.