The dealer follows fixed mandatory rules with no decisions. Understanding those rules tells you exactly when the dealer is likely to bust and when they're likely to make a strong hand — which drives every basic strategy decision you make.
The dealer must hit on any total of 16 or below. The dealer must stand on any hard 17 or above. There are no exceptions and no dealer discretion. This rule applies to every casino and every table.
Any total of 16 or below. Hard or soft — the dealer draws another card.
Any hard 17, 18, 19, 20, or 21. The dealer stops and player hands are compared.
S17 tables: dealer stands on soft 17 (better for player). H17 tables: dealer hits soft 17 (worse for player, adds 0.22% house edge).
The dealer's visible upcard tells you how likely they are to bust. This is the single most important factor in basic strategy decisions. Dealer 5 and 6 are the weakest upcards — they bust more than 40% of the time. Ace is the strongest.
| Dealer upcard | Dealer bust % | Strength |
|---|---|---|
| 2 | 35.3% | Weak |
| 3 | 37.6% | Weak |
| 4 | 40.3% | Very weak |
| 5 | 42.3% | Very weak |
| 6 | 42.1% | Very weak |
| 7 | 25.8% | Neutral |
| 8 | 23.9% | Neutral |
| 9 | 23.3% | Strong |
| 10 / Face | 23.1% | Strong |
| Ace | 17.0% | Strongest |
6-deck S17 game. Ace bust rate is after the dealer checks for blackjack.
When the dealer shows a 4, 5, or 6, basic strategy becomes defensive. You stand on hands you would normally hit, and you double and split aggressively to get more money on the table while the dealer is likely to bust.
When the dealer shows a 9, 10, or ace, the opposite is true. You hit more aggressively to try to reach a strong total, because waiting for the dealer to bust isn't a reliable strategy when their bust rate is only 17–23%.
In most US casinos, the dealer peeks at their hole card when showing an ace or a ten-value card. If they have blackjack, the hand ends immediately and all players lose their bets (except other blackjacks, which push).
This matters because it means if the dealer doesn't have blackjack, you know something about the hole card: it is not a ten when the upcard is an ace, and not an ace when the upcard is a ten. Basic strategy accounts for this automatically.
Some international casinos use a no-peek rule where the dealer doesn't check for blackjack until after all players act. If you double or split and the dealer has blackjack, you lose the extra bet too. This changes a few strategy decisions and adds slightly to the house edge.
The dealer's biggest advantage isn't their rules — it's the order of play. Players act first. If you bust, you lose your bet immediately, before the dealer even reveals their hole card. Even if the dealer would have busted too, your chips are already gone.
This is the house's core structural edge in blackjack. Basic strategy minimizes it by making the mathematically correct decision every time, but it cannot eliminate it entirely. That's why the house edge is 0.44% even with perfect basic strategy — not zero.
Blackjack GTO shows the dealer's full hand after each round and explains why each strategy decision was correct based on the dealer's upcard. No money, no sign-up.
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