Blackjack Strategy Guide | Basic Strategy Charts | Flush

Blackjack Basic Strategy: The Mathematically Correct Play Every Time

Basic strategy is the most powerful tool available to a blackjack player. It’s not a system or a trick, it’s the mathematically proven optimal decision for every possible hand combination against every possible dealer upcard. When applied perfectly, it reduces the house edge to approximately 0.5%, turning blackjack into the highest-RTP casino game available at Flush. This guide gives you the full basic strategy chart and teaches you exactly how to apply it.

What Is Basic Strategy?

Basic strategy is a complete decision matrix for blackjack. For every combination of your hand total and the dealer’s visible upcard, there is one optimal action: Hit, Stand, Double Down, Split, or Surrender. These decisions were determined through computer simulation of billions of hands and are based on pure probability.

What basic strategy achieves:

Without strategy: average house edge of 2–4%
With basic strategy: house edge drops to approximately 0.5%
That translates to an RTP of roughly 99.5%

This is not a small improvement. At a 2% house edge, a player wagering $1,000 per session expects to lose $20 per hour on average. At 0.5%, that drops to $5 per hour. Over time, this is the difference between thousands of dollars.

Why Basic Strategy Works

Blackjack is unique among casino games because the player acts first. If you bust, you lose your bet immediately, regardless of whether the dealer would have busted too. Basic strategy accounts for this asymmetry.

The key insight is the dealer’s upcard. The dealer’s face-down card (hole card) is unknown, but basic strategy makes assumptions about its most likely value. Since there are more 10-value cards in a deck (10, J, Q, K = 4 card types) than any other value, the most common assumption is that the dealer’s hole card is a 10.

Dealer with a 6 showing (weak): Assume dealer has 16 total → must hit → likely to bust. Your correct play: stand with anything reasonable, let dealer take the risk.

Dealer with an Ace showing (strong): Dealer has a potential 21. Your correct play: be aggressive, hit or double to improve your hand.

Hard Total Strategy

A “hard” hand contains no usable Ace (or an Ace that must count as 1). These are the most common hands.

Your Hard Total	Dealer Shows 2	3	4	5	6	7	8	9	10	Ace
8 or less	H	H	H	H	H	H	H	H	H	H
9	H	D	D	D	D	H	H	H	H	H
10	D	D	D	D	D	D	D	D	H	H
11	D	D	D	D	D	D	D	D	D	H
12	H	H	S	S	S	H	H	H	H	H
13	S	S	S	S	S	H	H	H	H	H
14	S	S	S	S	S	H	H	H	H	H
15	S	S	S	S	S	H	H	H	H	H
16	S	S	S	S	S	H	H	H	H	H
17+	S	S	S	S	S	S	S	S	S	S

H = Hit, S = Stand, D = Double Down (hit if not allowed)

Key Hard Total Rules to Memorize

Hard 8 or less: Always hit. You can’t bust and need improvement.

Hard 9: Double against dealer 3–6 (dealer is weak, your 9 can build to 19). Hit against everything else.

Hard 10: Double against dealer 2–9. You have a strong starting total: put more money on it when the dealer is vulnerable. Hit against 10 or Ace.

Hard 11: The most powerful doubling hand. Double against dealer 2–10. The chance of making 21 is highest when you hold 11. Hit against dealer Ace (they have potential natural).

Hard 12: Only stand against dealer 4, 5, 6, dealer is highly likely to bust. Hit everywhere else (yes, hit 12 vs dealer 2 or 3, the math supports it).

Hard 13–16: Stand against dealer 2–6 (let them bust). Hit against dealer 7+ (dealer has too strong a position).

Hard 17+: Always stand. Even hard 17 shouldn’t be hit. The risk of busting outweighs any benefit.

Soft Hand Strategy

A soft hand contains an Ace that can still count as 11. The key advantage: you cannot bust on the next hit from a soft hand.

Your Soft Hand	Dealer Shows 2	3	4	5	6	7	8	9	10	Ace
Soft 13 (A,2)	H	H	H	D	D	H	H	H	H	H
Soft 14 (A,3)	H	H	H	D	D	H	H	H	H	H
Soft 15 (A,4)	H	H	D	D	D	H	H	H	H	H
Soft 16 (A,5)	H	H	D	D	D	H	H	H	H	H
Soft 17 (A,6)	H	D	D	D	D	H	H	H	H	H
Soft 18 (A,7)	S	D	D	D	D	S	S	H	H	H
Soft 19 (A,8)	S	S	S	S	D	S	S	S	S	S
Soft 20 (A,9)	S	S	S	S	S	S	S	S	S	S

Key Soft Hand Rules

Soft 13–15: Hit against most dealers. Double only when dealer shows 5 or 6 (weakest upcards).

Soft 16–17: Double against dealer 4–6. Otherwise hit.

Soft 18: The tricky hand. Double against 3–6. Stand against 7–8 (your 18 beats dealer’s likely 17). Hit against 9, 10, Ace (dealer’s likely to have 19+: you need to improve).

Soft 19–21: Stand always. These are strong hands.

Pair Splitting Strategy

When your first two cards are a matching pair, you may split them into two hands. The decision depends heavily on the dealer’s upcard.

Your Pair	Dealer Shows 2	3	4	5	6	7	8	9	10	Ace
2s, 3s	SP	SP	SP	SP	SP	SP	H	H	H	H
4s	H	H	H	SP	SP	H	H	H	H	H
5s	D	D	D	D	D	D	D	D	H	H
6s	SP	SP	SP	SP	SP	H	H	H	H	H
7s	SP	SP	SP	SP	SP	SP	H	H	H	H
8s	SP	SP	SP	SP	SP	SP	SP	SP	SP	SP
9s	SP	SP	SP	SP	SP	S	SP	SP	S	S
10s	S	S	S	S	S	S	S	S	S	S
Aces	SP	SP	SP	SP	SP	SP	SP	SP	SP	SP

SP = Split, H = Hit, S = Stand, D = Double

Essential Splitting Rules

Always split Aces: Two chances to build 21. Never pass this up.

Always split 8s: Two 8s = hard 16 (one of the worst hands). Two separate 8-starting hands are significantly better.

Never split 5s: 10 is a premium doubling hand. Splitting 5s creates two weak 5-starting hands.

Never split 10s: Hard 20 wins almost always. Breaking it is a major error.

Split 9s except vs 7, 10, Ace: Two 9s = 18. Against dealer 7, your 18 beats their likely 17. Against 10 or Ace, dealer is too strong.

Surrender Strategy

Surrender is available in some blackjack variants. When to use it:

Your Hand	Dealer Shows	Action
Hard 16	9, 10, Ace	Surrender
Hard 15	10	Surrender
Hard 17	Ace (if dealer hits soft 17)	Surrender

Surrendering saves you half your bet in situations where you’d lose more often than win even with perfect play. Don’t over-surrender, use it only in the cases above.

Common Mistakes Players Make

Hitting hard 17: This is the most common error. Even against an Ace, standing on hard 17 is correct. The chance of improving without busting is too low.

Not doubling when the chart says to: Players are afraid to put more money down in uncertain situations. The math says doubling is the right play, trust it.

Splitting 10s: A hard 20 wins approximately 93% of the time. Splitting destroys this strong position.

Taking insurance: Already covered in the how-to-play guide, never take it. House edge exceeds 7%.

Standing on soft 18 against 9, 10, or Ace: Your 18 is beaten by dealer’s likely 19+. Hit.

Deviating based on “feelings”: Basic strategy works because it’s based on mathematics, not intuition. Trust the chart, even when it feels wrong.

How to Practice Basic Strategy

Method 1: Demo Mode at Flush

Every blackjack variant at Flush offers demo mode with virtual credits. Use it to practice with zero financial risk until decisions feel automatic.

Method 2: Strategy Card

Print the basic strategy chart and keep it nearby while playing. Most casinos (online and live) allow this, there’s no rule against it.

Method 3: Dedicated Apps

Blackjack training apps drill you on decisions and mark errors. Apps like “Blackjack Strategy Trainer” (various platforms) identify which situations you’re getting wrong.

Method 4: Flashcard Memorization

Focus on the exceptions first: soft 18, the 9s pair split exceptions, the hard 12 hit-or-stand decision vs 2 or 3. These are the scenarios players most commonly misplay.

Card Counting: Overview

Card counting is a legitimate technique used in land-based casinos to gain a mathematical edge over the house. The most common system is Hi-Lo:

Hi-Lo System:

Cards 2–6: Count +1 (low cards removed = deck more favorable to player)
Cards 7–9: Count 0 (neutral)
Cards 10, J, Q, K, Ace: Count -1 (high cards removed = less favorable)

A high positive count means many low cards have been removed, the remaining deck is rich in 10s and Aces, favoring the player. You increase bets when the count is high.

At Flush: Counting is not practical in live dealer online blackjack because shoes are shuffled very frequently (often after every hand or after a set percentage of the shoe is played). Basic strategy is far more valuable for online play. Understanding the math behind counting, however, helps you appreciate why basic strategy decisions are correct.

Blackjack Variants at Flush

Variant	Key Difference	House Edge (Basic Strategy)
Standard Blackjack	Classic rules, 6-8 deck	~0.5%
Infinite Blackjack	Unlimited players, one hand	~0.6%
Speed Blackjack	Fastest card goes to decision-first player	~0.5%
Blackjack VIP	Higher limits, same rules	~0.5%
Lightning Blackjack	Random multipliers on wins	~0.44% (varies)

Frequently Asked Questions

Q: Does basic strategy guarantee I’ll win? No. Basic strategy minimizes the house edge but doesn’t eliminate it. You’ll still have losing sessions, variance is real. What basic strategy does is ensure you’re making the mathematically optimal decision every time, giving you the best possible long-term outcome.

Q: How long does it take to learn basic strategy? The full chart has about 250 decision cells, but 80% of hands fall into simple patterns. You can memorize the core rules in a few hours of practice. Mastery, where decisions feel automatic, takes a few weeks of regular play.

Q: Should I deviate from basic strategy if I’m on a winning streak? No. Streaks are random variance, not predictive signals. The math doesn’t change because you’ve won the last 5 hands. Continue applying strategy consistently.

Q: Is there a simpler version of basic strategy? Yes. A simplified version covers the most impactful decisions: always split Aces and 8s, never split 5s or 10s, always double 11, stand on 17+, and hit 8 or less. This isn’t perfect but is far better than guessing.

Q: What is the house edge at Flush’s blackjack tables? With perfect basic strategy on standard multi-deck games, the house edge is approximately 0.5%, one of the lowest of any casino game.

Q: Does it matter which blackjack variant I choose? Yes. Variants with bonus features (like Lightning Blackjack) can have different house edges. Always check the rules and payout structure. The most important factors are 3:2 blackjack payout (not 6:5) and dealer standing on soft 17.

Q: Can I use basic strategy in live blackjack at Flush? Absolutely. Basic strategy works identically whether you’re playing RNG or live dealer blackjack. There’s no rule against consulting a strategy chart during play.

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FAQ

What is basic strategy in blackjack and why does it matter?

Basic strategy is the complete set of mathematically optimal decisions for every possible blackjack hand combination against every possible dealer upcard. It was derived through exhaustive probability calculations by Baldwin, Cantey, Maisel, and McDermott in 1956 and refined by Edward Thorp in the early 1960s. At Flush, applying basic strategy correctly on every hand reduces the house edge on standard multi-deck blackjack to approximately 0.5%. Deviating from basic strategy, even with well-intentioned guesses, typically raises the house edge by one to two percentage points, turning a 99.5% RTP game into the equivalent of a 97% to 98% proposition.

How does basic strategy reduce the house edge to 0.5%?

The house edge originates from the dealer completing their hand after the player, meaning a player bust loses regardless of the dealer’s eventual outcome. Basic strategy minimises the cost of this structural disadvantage by identifying the exact decision (hit, stand, double, split, surrender) that produces the best expected value on every hand. The chart encodes roughly 250 decision cells covering hard totals, soft totals, and pair splitting. High-impact rules that account for most of the edge recovery include: always doubling 11, splitting Aces and 8s, never splitting 5s or 10s, and standing on hard 17 or above against any dealer upcard.

Is card counting legal at Flush’s live blackjack tables?

Card counting is not illegal anywhere, but it is ineffective at Flush’s live online blackjack tables. Evolution Gaming live tables use six to eight deck shoes with a cut card inserted at approximately 50% penetration, meaning roughly half the shoe is never dealt before a reshuffle. The remaining undealt cards after the cut point are too numerous for the composition of the remaining deck to carry meaningful count-derived edge. In live online blackjack, many tables also reshuffle after every hand using continuous shuffle machines. Card counting is a practical consideration for single or double-deck physical casino blackjack, not for the live online format at Flush.

When should I deviate from basic strategy?

In standard play at Flush, you should not deviate from basic strategy based on intuition, streaks, or dealer patterns. The chart represents the mathematically correct decision for each hand regardless of recent outcomes. The only legitimate basis for deviation is composition-dependent strategy in very specific situations: for example, standing on a hard 16 against dealer 10 when your 16 contains a 10 (known as composition-dependent basic strategy). These deviations are minor and only relevant in single-deck games, which are uncommon in Flush’s live casino suite. For all practical purposes at Flush, the standard multi-deck basic strategy chart should be followed exactly on every hand.

How do I apply basic strategy at Flush’s live blackjack tables?

Basic strategy can be applied at all Flush live blackjack tables without restriction. The simplest approach is to use a basic strategy chart (freely available online and on apps) alongside the game. At Flush live tables, each hand decision is made via the interface buttons (Hit, Stand, Double, Split) and there is no time penalty for taking a few seconds to consult a chart before clicking. Speed Blackjack at Flush requires somewhat faster decisions as hands are awarded to the first player to act, but the decision set is the same. Practice on RNG blackjack at Flush first to build automatic recall of the most common hand decisions before moving to live tables where decision speed matters more. For responsible gambling support, visit GamCare.

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