When to Split Pairs in Blackjack
Splitting is where blackjack beginners freeze. You're dealt a pair, the dealer's waiting, and the choice is "two hands or one?" with money on both. Good news: two of the calls are automatic, two are never, and the rest follow the same pattern as the whole game - split into the dealer's weakness. Here are the rules worth memorizing.
The two automatics
- Always split Aces. Two hands each starting with an 11 is far better than one stuck hand - and a split Ace that catches a 10 is a strong 21 (though usually paid as a regular win, not a 3:2 blackjack).
- Always split 8s. A pair of 8s is 16 - the single worst hand in blackjack, too low to stand and a bust waiting to happen if you hit. Splitting throws away that 16 and starts two hands at 8. You're not chasing a big win here; you're escaping a loser.
These two never change, regardless of the dealer's upcard. Aces and 8s, every time.
The two nevers
- Never split 10s. A pair of 10-value cards is a 20 - one of the best hands you can hold. Breaking it apart to chase two 20s is greed that costs you on average. Keep the 20 and stand.
- Never split 5s. Two 5s is a 10, a great doubling hand. Splitting turns one strong start into two weak hands that each start at 5. Double the 10 (or hit it) instead.
The rest: split into the dealer's weakness
Every other pair follows the game's core logic - get aggressive when the dealer is likely to bust (showing 2 through 6), play it safe when they're strong. The shorthand:
- 2s, 3s, and 7s - split against a dealer 2 through 7.
- 6s - split against 2 through 6.
- 4s - only split against 5 or 6 (and only if you can double after splitting); otherwise just hit.
- 9s - split against 2 through 9, but stand against 7, 10, or Ace. The 7 exception matters: your pair of 9s is 18, a dealer 7 most often makes 17, so your 18 already wins - don't break it.
Don't memorize it cold - drill it
To be honest, splits are the decisions most likely to desert you under pressure, because a few of them feel wrong (standing on 9s versus a 7, not splitting that tempting pair of 10s). Reading the list once won't stick. The strategy drill deals you random pairs and grades every call against perfect play, and the full strategy chart shows every split in one grid. A few minutes of reps and the pattern - always Aces and 8s, never 10s and 5s, the rest into a weak dealer - becomes second nature.
Random pairs, instant feedback, graded against perfect basic strategy.
Frequently Asked Questions
What pairs should you always split?
Aces and 8s, no matter the dealer's upcard. Aces give two hands starting at 11; splitting 8s escapes a 16, the worst hand in the game.
What pairs should you never split?
10s (you already have 20) and 5s (you have 10; double or hit instead).
When do you split 9s?
Against a dealer 2-9, but stand against 7, 10, or Ace. Your 18 already beats the dealer's likely 17 on a 7.
Why split 8s?
Because 16 is the worst hand in blackjack. Splitting ditches the 16 and starts two hands at 8 - an escape, not a power play.