A pair of 10s is one of the strongest hands in blackjack, and basic strategy is blunt about what to do with it: stand.
A hand of 20 wins more often than either hand a split creates, worth $140 per 100 hands at a $10 stake. Splitting only makes sense in two situations, and neither applies to the average player at the table.
Two types of players split a pair of 10s. One is the casual player who doesn't know the correct strategy. The other is the professional who knows the game inside out and is playing for something beyond the value of a single hand. Here's why the same move is a mistake for the first and a calculated decision for the second.
The short version:
- Average players should never split 10s and should always stand on 20.
- Card counters will sometimes split in ten-rich decks.
- Tournament players will sometimes split when they need more chips in play, especially on the last hand.
What Is a 10-Value Card in Blackjack?
In blackjack, a 10-value card is a 10, a Jack, a Queen or a King. All four count as ten, so a pair of 10s can be made up of any two of them.
Suits make no difference, and neither do the ranks themselves. If both cards are worth ten, you're holding a 20, and the pair splitting rules apply.
Sixteen of the 52 cards in a standard deck carry a value of ten, which is why this pair turns up as often as it does. If you're still getting to grips with how to play blackjack, that density is one of the most useful facts to hold on to.
What Are Your Options With a Pair of 10s?
There are only two playing options worth considering when holding a pair of 10s:
- Stand
- Split
Stand and you keep a single hand of 20. Split and you're playing two hands, each starting with a 10 and each carrying its own bet. Hitting a hard 20 is never correct, and doubling down on it isn't either, so the decision comes down to those two.
Re-Splitting 10s
Some land-based and online casinos let you re-split up to a maximum of three or four hands. If you split 10s and draw another 10 to either hand, you'd have the option to split again and end up with three or four hands, each starting with a 10.
Since splitting 10s is already the weaker play, re-splitting compounds the mistake. Never do it.
Why Standing on 20 Beats Splitting 10s
Most casual players who split 10s do it against a weak dealer upcard like a 5 or a 6, though plenty split no matter what the dealer shows.
The reasoning usually runs the same way: the dealer looks vulnerable, two hands starting with a 10 both look strong, so why not get twice as much on the table?
Expected value – the average amount you win or lose per hand over the long run – settles it, and it's the only measure that answers this question properly. The comparison below uses a dealer upcard of 5 in a typical six-deck game where the dealer stands on soft 17.
- Stand on the pair of 10s and you win 83% of the time and lose 17% of the time. A hand of 20 is hard for the dealer to beat.
- Split the 10s once and each new hand wins 63% of the time and loses 37% of the time. You'll often finish with less than 20 on both hands.
Run that over 100 hands at $10 a hand.
Standing:
- You win $10 x 100 x 0.83 = $830
- You lose $10 x 100 x 0.17 = $170
- Net: $660
Splitting:
- Each split hand wins $10 x 100 x 0.63 = $630
- Each split hand loses $10 x 100 x 0.37 = $370
- Net per split hand: $260
- Across both hands: $520
Standing comes out $140 ahead over those 100 hands. Run the same comparison for any other dealer upcard, any mix of house rules and any number of decks, and the result holds. If you're not counting cards, standing on a pair of 10s returns more than splitting them.
When Should You Split 10s?
Two situations justify it, and both sit outside basic strategy. If you're playing basic strategy without counting cards, standing is the better play every time.
When the Deck Is Rich in 10s
The first is an excess of 10-value cards among the unplayed cards, which makes it more likely you'll draw a ten to each split 10 and finish with two hands of 20. The only way to know that is by counting cards.
Players using the Hi-Lo system, for example, will split tens against a dealer 5 when the true count, the count per deck, reaches +5 or higher.
Even then, the play carries a cost. In a land-based casino, splitting 10s draws attention from the pit, because it's exactly the kind of deviation counters make. It's mathematically correct and still not worth doing repeatedly in a single session.
On the Last Hand of a Tournament
The second is the closing round of a blackjack tournament, where the winner is whoever holds the most chips after a set number of hands. If winning your current bet still leaves you short of the leader, but winning twice that amount overtakes them, splitting 10s becomes the right move.
Picture the final hand. The leader is $2,000 ahead of you and bets first, putting out the $5,000 maximum. You match it. If you both win, you're eliminated, because the $2,000 gap survives.
The only way to close it is to get more money on the table, which means splitting or doubling down. You're dealt a pair of queens, split them, add another $5,000, and draw a picture card to each hand for two 20s. The dealer busts. You've won $10,000 on the hand against the leader's $5,000, and you finish $3,000 clear.
One condition applies. Split your bankroll before you bet, or you won't have the chips to pair split when the moment arrives. Unlike doubling down, you can't pair split for less.
Key Takeaways
- A pair of 10s is a 20, and 20 is strong enough that splitting it gives away value.
- Basic strategy players should stand on 10s against every dealer upcard, including a 5 or a 6.
- Over 100 hands at $10, standing returns $660 against $520 for splitting, a gap of $140.
- Re-splitting 10s is a worse play than splitting them once.
- Card counters split 10s only when the true count is high enough to make two 20s likely.
- Tournament players split 10s when they need more chips in play on the final hand.
- In a tournament, split your bankroll before betting; otherwise, the option won't be available.
