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7 costly blackjack mistakes
Most players don't lose because of bad luck, but because of a handful of mistakes repeated hand after hand. Here they are, from the most technical to the most important.
1. Taking insurance
When the dealer shows an Ace, you're offered "insurance" paying 2:1 if they have blackjack. It sounds prudent; it's actually a separate, unfavourable bet. In an 8-deck shoe slightly less than one card in three is worth 10, and you'd need exactly one in three for the bet to break even. Without counting (true count +3 or higher), decline it — even holding blackjack.
2. Mimicking the dealer
"I hit to 16 and stand on 17, like the house." It sounds logical, but the dealer has a decisive advantage: you act first, and if you bust you lose even if the dealer busts afterwards. Playing like the dealer means accepting a disadvantage of roughly 5–6% — ten times worse than basic strategy.
3. Never risking a bust
The opposite is just as costly: standing on 12–16 against a 7, 8, 9, 10 or Ace because you're afraid of busting. Against those cards the dealer too often ends on 17–21, so your 15 almost always loses. Hitting hurts, but it's the play that loses least.
4. Splitting 10s
20 is one of the best hands in the game: it wins far more often than it loses, whatever the dealer shows. Splitting a pair of 10s (or face cards) turns an excellent hand into two average ones. Tempting against a 5 or 6, but it's a mistake under basic strategy.
5. Forgetting to double
Doubles are the moments you put more money on the table while you're the favourite. Missing them leaves value behind: 11 vs 6, 10 vs 9, A-6 vs 4 (soft hand), 9 vs 5… Many players never dare double a soft hand, yet it's one of the most profitable plays against a weak dealer.
6. Trusting "gut feel" or streaks
"The dealer has won five in a row, it's bound to turn." Past hands don't change the odds of the next one (except, with a real shoe, through the composition of the remaining cards — which is what counting measures). The right call is in the chart, not in the results history.
7. Chasing losses
This is the most expensive mistake, and there's nothing technical about it. Raising your bets to "win it back" after a losing streak speeds up losses and blows through the budget you planned. Basic strategy reduces the casino's edge; it doesn't cancel it.
How Hitwise helps
Mistakes 1 to 6 come from decisions made in the heat of the moment. Hitwise gives you the computed answer in three clicks, including soft hands and pairs, where people go wrong most. For mistake #7, no tool replaces discipline: setting limits is up to you.
Frequently asked questions
Should you take insurance in blackjack?
No — unless you're counting cards and the true count is +3 or higher. It's a separate, unfavourable bet, even when you hold blackjack.
What's the worst blackjack mistake?
Chasing losses: raising your bets to win it back speeds up losses and blows your budget.