This pattern is what many players find confusing. Split against 2 through 6 and also against 8 and 9, but Stand against 7, then Stand again against 10 and Ace.
The 7 sitting in the middle of the Split range looks like an exception, and in a sense it is. The reason makes perfect sense once you understand what the Dealer is likely to do with each of those upcards.
Exact basic strategy decisions can shift slightly depending on the number of decks in play, whether the Dealer Hits or Stands on Soft 17, and whether Double After Split or Surrender is available. Always use a Basic Strategy chart matched to your specific game rules. For a full discussion of those variations, please refer to my earlier articles in this series.
pair of 9s gives you hard 18. That is a strong total. Most Blackjack players know that 18 wins more often than it loses, and the instinct to protect that hand by Standing is completely understandable.
The problem is that Blackjack strategy is not about protecting a good-looking hand. It is about making decisions that perform best over time against the specific situation in which you are. And against certain Dealer upcards, two separate hands starting from 9 each, are mathematically better than one Standing 18.
That is the tension at the heart of the pair of 9s decision.
You are not choosing between a good option and a bad one. You are choosing between two options that are both reasonable, and Basic Strategy identifies which one is better in each specific Dealer upcard situation.
