Blackjack Tips
A blackjack tip is worth following only if it saves money, so every tip on this page comes with a price. Each misplay is measured on the six-deck reference game of these pages: soft 17 stood on, a natural paid 3:2. A player who follows the chart there without a slip gives up 0.41% of each initial bet. A point is one percentage point of house edge, which works out to one unit lost per 100 initial bets.
The basic strategy guide holds the charts themselves, and the blackjack odds page prices each table rule before a card is dealt. This page prices the other half: what the player adds by leaving the chart.
The Costliest Mistakes, Ranked
Each row is one wrong play repeated whenever its hand appears, with every other hand played by the chart. The second column spreads that loss over all rounds, so it adds straight onto the house edge; the third is the loss on the hand itself, per 100 units of the original stake. For the two rows that group several hands, the third and fourth columns are averages over the whole group.
Why Some Mistakes Cost So Much More
A misplay's price is two numbers multiplied: how much it gives away on the hand, and how often that hand is dealt. Splitting tens tops the list because it is both common and costly. A pair of ten-value cards turns up about once every 11 rounds, and breaking up that 20 forfeits 65.2 units per 100 staked each time, so a player who always splits them adds 5.84 points to the game.
Drawing to hard 13 through 16 against a dealer 2 to 6 comes second mainly through frequency, since stiff totals facing a weak upcard are dealt all the time. Taking a card on every one of them adds 1.558 points: those upcards bust the dealer more often than any others, and each hit gives the player a chance to bust first.
The key point: A rare hand can still be an expensive one. A pair of fives is dealt only about once in 185 rounds, yet splitting it throws away a strong 10 for two weak starts and costs 68.5 units per 100 staked every time.
Skipped doubles sit in the middle of the table. Hitting an 11 instead of doubling it costs 16.3 units per 100 staked on that hand and 0.739 points over the whole game, because the extra stake belongs on a hand that is already ahead. How every double and every pair split is valued against each upcard is laid out on the doubling page and the splitting page.
What a Whole Habit Costs
Each of the first four habits drops one kind of move from otherwise correct play and takes the next best option instead; the last adds a half-stake insurance bet whenever an ace shows. The surrender row adds late surrender to the reference table, where correct play costs 0.33%.
Shortcuts That Replace the Chart
Doubling and splitting are where the money is won back. A player who never puts out the extra stake raises the house edge from 0.41% to 2.35%, and doubling alone accounts for most of that gap. Surrender is a smaller tool: skipping it on a table that offers late surrender costs 0.07 points, and the hands where it pays are listed on the surrender page.
Two simple systems replace the chart with one rule each, and both are far more expensive than any single mistake above. Copying the dealer, who draws below 17 and never doubles or splits, gives the house 5.68% of every bet. Refusing to draw to any hard 12 or more, so that no hand can bust, is dearer still at 6.01%.
In short: Either shortcut gives up more than every row of the ranked table below the first put together, because it misplays whole groups of hands in every round.
Taking insurance on every dealer ace is the one habit that involves no decision about the hand. An ace shows about once in 13 rounds, and a half-stake insurance bet on each of them adds 0.28 points to the six-deck game, which then costs 0.69% in all. Why the bet is priced that way, and how even money fits in, is covered on the insurance page.
Checks to Make at Any Table
These come before the first decision of a session. Where a figure appears, it is for the six-deck reference game.
Look for 3:2 on the felt or in the rules screen before anything else. A table that pays 6:5 instead adds 1.36 points to the house edge, which at 10 units a round comes to 13.6 units lost per 100 rounds on top of the usual price. The payouts page compares 3:2, 6:5 and 1:1 by deck count.
A dealer who hits soft 17 instead of standing on it adds 0.21 points on six decks, and it also moves a few cells of the chart. Check the rule card or help screen for the exact wording, then pick the chart that matches. The soft 17 page explains why the dealer's extra card costs the player.
A side bet involves no decisions, so no skill lowers its price. 21+3 on its common 100/40/30/10/5 schedule keeps 4.62% of each stake on six decks, against 0.41% for the main hand played by the chart. The side bets page sets every one of them side by side, pay table by pay table.
The plays in the ranked table feel wrong until they become habit, and the cheapest place to build one is a table with no money on it. Keep the chart for the game's rules open and play every hand by it on one of the free blackjack games, with no account needed. Play for money only with money you can afford to lose.
Table Beliefs That Cost Money
A pair of tens deserves two chances
Two tens are two shots at 20, so splitting them doubles a winning hand.
Reality Check
Facing a 6, a standing 20 averages +70.3 for every 100 units wagered, the split only +45.5. The split trades a hand that is already winning for two hands that still have to be built, and kept up as a habit it lifts the casino's margin by 5.84 points.
Eights against a ten are hopeless
Splitting 8,8 against a dealer 10 just means losing two bets instead of one.
Reality Check
Both choices lose on average, and the split loses less: −47.5 per 100 units staked, compared with −53.5 when the pair is hit as a total of 16. Sixteen is the weakest total a player can hold, while each eight begins a hand with a real future.
Eleven against a ten is too risky to double
With a ten showing, an 11 should take its cards one at a time to stay flexible.
Reality Check
Doubling returns +17.7 per 100 units staked; drawing without the double returns +11.8. The hand is already the favorite, so the extra stake goes in exactly where it earns, and skipping the double on 11 across every upcard adds 0.739 points to the edge.
Ace-six is a finished hand
A soft 17 already totals 17, so standing protects it.
Reality Check
No card can bust a soft 17, and a standing 17 only wins when the dealer busts. Leaving it alone instead of drawing or doubling gives away 22.4 for every 100 wagered whenever it comes up, a drain of 0.254 points on the whole game.
Surrender is for quitters
Handing back half a bet is always worse than playing the hand to the end.
Reality Check
Hard 16 played on against a 10 returns −53.5 per 100 units staked, while surrendering returns exactly −50.0. On a table that offers it, a player who never surrenders hands the casino 0.07 extra points; the surrender guide lists every hand where it pays.
Blackjack Tips: FAQs
Yes, close to it. Each mistake on the list involves a different hand, so a player who makes three of them pays roughly the sum of their three rows.
Yes. The house edge is charged on every bet, so the more rounds an hour, the larger the expected loss over that hour. An automated table deals far more rounds in an hour than a live dealer does, and every habitual mistake repeats at the same faster pace.
Close, but not identical. They are priced on a six-deck game whose dealer stands on soft 17. On another rule set a few chart cells move and the costs shift, mostly by small amounts, since nearly every play on the list is the same under all the common rules.
Not in a single session. The swing of a few hundred hands is far larger than any of these costs, so a player can make every mistake on the list and still finish ahead on the day. The price shows only over a long run, which is why it is easy to miss.