Blackjack 21 Optimal Strategy

  

When playing blackjack there are things you can do to make sure you optimise your chances of walking away from the table a winner. Mainly these optimisation skills are to do with decisions you make under certain circumstance. The blackjack strategy chart is a tool which can guide a player into making the decisions which give you the best odds of tasting success when playing 21.

When Dr. Edward O. Thorp first published Beat the Dealer, online blackjack did not exist so his optimal play strategies weren’t created with the Internet in mind. Lucky for us, players all around the globe who have been connected via the world wide web have created and shared strategy charts that have been tested by computers to ensure optimal play for standard blackjack titles.

Best online blackjack casinos

Two blackjack strategy charts are shown here. Both strategies use the same statistical information but in different presentation formats. It's not necessary to memorize both charts but you need to know one of the two perfectly. The Condensed Optimal Strategy is the easiest for most to remember and use. Since the player's hand constantly changes. Now that you know the basics of 21 card game rules, you can have fun playing online and casino table games for real cash or just for fun. The more you study particular games and learn to apply basic blackjack 21 strategy, the more you just might find yourself beating the house and winning more cash. Doubling in blackjack is a strategy employed by player when they deem the total of their hand leaves them in a favourable position to beat the dealer. How to double In order to double down, you must place a bet equal to your original wager in exchange for one more, and only one more, card to be dealt to your hand. The “In-Between” Split System: 1-3-2-6 Blackjack Betting System. Seemingly complicated, the 1-3-2-6 blackjack betting strategy is actually much simpler than it looks at first glance. After deciding on the betting unit, the players will just need to make sure that the system is executed correctly, in accordance with the 1-3-2-6 sequence.

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How to read the blackjack strategy chart

The most important key when using a blackjack strategy chart is you are reading it correctly as it tells you when to hit, stand, split, double, or surrender and if you mix these actions up and perform them at the wrong time you could lose when you potentially could’ve won.

Good strategy charts for blackjack are colour coded with letters standing for the action with a key to match. For example H stands for hit, S represents stand, P stands for split and so on. These could vary depending on what chart you’re using so read the key carefully.

The dealer’s card is generally along the horizontal axis while the player’s hand is along the vertical axis. There are sections dedicated to hard hands, soft hands, and splits. Each move recommended based on the player’s hand and the dealer’s hand has been created by statistics, but obviously there is still an element of luck.

There are two strategy charts, one for when the dealer hits on a soft 17 and one for when a dealer hits on a hard 17. It is imperative you know which rule variation you are playing when using these charts as there are moves that differ from one another depending on what the dealer does. There are also charts for other variations of blackjack, however these are less common.

If you are playing at a land-based casino where you can’t set the pace of the game, it might be best to memorise key moves instead of the entire chart, to keep it simple in your head. For example, players should hit if you have from five to eight for a hard hand and on 12 to 15 for a soft hand; double on a 10 if the dealer has two to nine with a hard hand and on 18 if the dealer has two to six on a soft hand; and finally never split fives, or 10s. These aren’t specific rules you need to learn, but it is better to take some moves from the chart than none if you can’t memorise them all.

Examples of optimal play in blackjack

While the strategy chart does not guarantee you will win if you choose to do the move it does mean you are playing at your best in terms of statistics. We mentioned above a few rules to possibly remember which are examples of optimal play, however we will give more depth to the following examples.

Hitting with a hard hand

If the dealer has anything from a two to an Ace, players should hit when they have anything from a four to an eight with a hard hand. When a player has a nine they should hit on any card the dealer may have but double down if they have a three to six if possible. These are just some of the possible examples of playing at your optimum when you have a hard hand. Again, the moves vary between the two charts.

Standing with a soft hand

With a soft hand it is recommended to stand for more possible combinations when the dealer hits on a soft 17, and less when the dealer stands on a soft 17. An example of this is when a dealer has a six and the player has a soft 19, with the rules that the dealer has to hit on a soft 17, it is recommended players double down if available. When the dealer stands on a soft 17 it is recommended the player stands. There are a few combinations where this occurs so it is important to know which chart you need.

When to split

As mentioned above it is suggested never to split fives or 10s. Splitting Aces and eights is a prime example of optimal blackjack play. It is also suggested to only split fours when the rule that you can split after doubling is in place but this only applies when the dealer has a four or a five.

This isn’t all of the examples possible, rather it is just a select few so it is best you view the chart and try it out for yourself.

Can I practice my blackjack strategy for free?

All our recommended online casinos offer a free play mode so players can open up the strategy chart in a tab and try out the moves. Once you are ready to play with real money just change modes, make a deposit and you can get going. The best thing about playing online whether you are in free mode or not is that you can take your time. At land-based casinos and live dealer versions, there is a set pace, and a set amount of time to make bets. When you are first learning to use the strategy chart, it is best to take your time so we believe playing online is the best option.

Real money blackjack websites

When you’re looking for a real money website to play 21 games at it is important to take several factors into consideration. It’s also very important to play at online casinos which are governed in a trusted location like the United Kingdom, Malta or Curacao, which are two of the online licensing bodies with strong reputations.

Generally casinos we endorse to international players are approved by eCOGRA which is an independent auditing organisation, based out of the UK.

If you visit a casino and there are not many deposit options, you should steer clear of playing there because there are better options available, catering to several currencies and payment methods.


Spanish 21 is a variation of the standard game Blackjack with a few differences. This article concentrates on those differences and assumes you know the basic rules of Blackjack. This can be found in this separate article if you need a refresher.

Spanish 21 vs Blackjack

The main difference between Spanish 21 and most other forms of Blackjack is that it is played with a Spanish deck of cards that has 48 cards instead of the usual 52 – the deck is the same with all 10’s removed.

As a 10 is an important card in all forms of Blackjack, you would have thought that this gives a huge advantage to the House. You would be correct if that was the only change, however, a number of other features have been added in an attempt to offset this. Spanish 21 actually has a slightly better edge for the player than many forms of Blackjack.

Spanish 21 Rules

Blackjack 21 Optimal Strategy Examples

OptimalBlackjack 21 optimal strategy example

• Late Surrender is allowed, not just after your first 2 cards have been dealt

• You are able to Double after a Split

• You can re Split Aces

BlackjackBlackjack

• A hand with 21 always wins even if the Dealer also gets 21

• Blackjack always wins even if the Dealer also gets Blackjack

• You can Double at any time after as many cards as you wish

• You can normally Hit and Double after Splitting Aces – this can vary so is worth checking

• You can Surrender after Doubling, known as Double Down rescue. You lose your initial stake which is effectively getting back half your total outlay for the initial stake and the Double

Variation of Rules

Spanish 21 does have some variables which differ depending on where you play so be sure you check these before you start playing.

• Either 6 decks or 8 decks of cards are used

• The dealer can sometimes Hit or Stand on soft 17 – a hand that includes an Ace meaning the Dealer has 7 or 17

• Some casinos will allow you to Double a hand up to 3 times

• Some casinos will not pay the bonus amounts after you Split a hand

Above is an example of the layout for a Spanish 21 table. This particular version sees the Dealer stand on all 17’s, other than this you will see it is very similar to a standard Blackjack table.

Spanish 21 Odds & Payouts

Payouts and odds can be slightly different from regular Blackjack.

• A 5-card 21 pays 3 to 2, a 6-card 21 pays 2 to 1 and 7-card or higher 21 pays 3 to 1. This bonus doesn’t count if you have previously Doubled

• A hand consisting of 6-7-8 or 7-7-7 of mixed suits pays 3 to 2, if suited it pays 2 to 1. Either of these hands with all Spades pays 3 to 1. Again, this doesn’t count if you have previously Doubled

• A suited 7-7-7 when the Dealer has a 7 face up pay $1,000 if your bet is between $5 and $24 and a whopping $5,000 Super Bonus if your bet was $25 or more. If you are playing live with other players, they will each receive a $50 ‘Envy Bonus’ if this comes in.

Spanish 21 Strategy

There are several variable rules for Spanish 21, which affect some of the decisions for an optimal strategy. The below Spanish 21 basic strategy is based on casinos that use 6 decks and the Dealer stands on a soft 17, which is the most common variation of the game.

Hard Hands – No Ace

Dealers Card
Your hand2345678910A
4 to 8HHHHHHHHHH
9HHHHD4HHHHH
10D5D5DDDD4D3HHH
11D4D5D5D5D5D4D4D4D3D3
12HHHHHHHHHH
13HHHHHHHHHH
14HHS4S5S4HHHHH
15S4S5S5S6S6HHHHH
16S5S6S6SSHHHHH
17SSSSSSS6S6S6SR
18+SSSSSSSSSS


H = Hit D = Double D2 = Double except Hit with x or more cards
SR = Surrender S = Stand S2 = Stand except Hit with x or more cards

Due to the bonus if you get 21 with 4 or more cards, in some instances it is best to Hit and go for these, in the above chart the number next to an action denotes the minimum number of cards you need in order to Hit as opposed to Stand or Double

Soft Hands – With an Ace

Dealers Card
Your hand2345678910A
12-15HHHHHHHHHH
16HHHHD4HHHHH
17HHD3D4D5HHHHH
18S4S4D4D5D5S6S4HHH
19-21SSSSSSSSSS


H = Hit D = Double D2 = Double except Hit with x or more cards
S = Stand S2 = Stand except Hit with x or more cards

Due to the bonus if you get 21 with 4 or more cards, in some instances it is best to Hit and go for these, in the above chart the number next to an action denotes the minimum number of cards you need in order to Hit as opposed to Stand or Double.

Pairs

Dealers Card
Your hand2345678910A
2,2SPSPSPSPSPSPSPHHH
3,3SPSPSPSPSPSPSPHHH
6,6HHSPSPSPHHHHH
7,7SPSPSPSPSPSP*HHHH
8,8SPSPSPSPSPSPSPSPSPSP
9,9SSPSPSPSPSSPSPSS
A,ASPSPSPSPSPSPSPSPSPSP


H = Hit D = Double
S = Stand SP = Split SP* = Split except for Suited 7’s in which case Hit

Double Down Surrender when you have 12-16 Vs 8-A, 17 Vs A

Never Split 4’s, 5’s or 10’s

Blackjack 21 Optimal Strategy Definition

Spanish 21 Tips

There are many extra things to remember in Spanish 21 compared to standard Blackjack, remember the extra bonus payouts for getting 21 with 4 or more cards and getting 7-7-7 or 7-8-9. These don’t count if you were to Double though, so in situations where you feel you have a chance to hit these, ensure you follow the table above for the optimal chance of winning.

Blackjack 21 Optimal Strategy Tactics

Don’t be afraid to Surrender – It is better to admit defeat and get some of your bet back in certain circumstances than continuing and losing it all when the odds are against you. Spanish 21 gives you the chance to Surrender at any time, ensure you make the most of it to stay ahead of the game.

Play for fun first if you want to learn the game properly – This is especially important when playing Spanish 21 as there are different features and rules than in standard Blackjack. We, therefore, recommend you play with free chips until you get the hang of this version when you have a better chance of finishing up.

Always play only with money you can afford to lose – this is the same for all casino games which should be fun – if you don’t enjoy it or are gambling with money you cannot afford to lose your mindset will not help the situation giving you a bigger chance of losing.

Blackjack References:

How to Count Cards
Blackjack For Real Money

Blackjack 21 Optimal Strategy Example


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