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Do you ever split 5's in blackjack?

One of the absolutes in blackjack is that you should never split 5s. Most players aren't even tempted, because they recognize they have a much stronger building block for a hand when they start with 10 than starting each of two hands with 5s.

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Splitting 5’s In Blackjack And Why It’s a No-No

By John Grochowski on Tuesday April 19, 2016

One of the absolutes in blackjack is that you should never split 5s. Most players aren’t even tempted, because they recognize they have a much stronger building block for a hand when they start with 10 than starting each of two hands with 5s. Nontheless, I received an email recently from a player who challenged the notion. He reasoned that when the dealer had a weak card such as a 5 or 6 face up, he had an edge. If he was dealt another 5, he wanted the opportunity to get a third bet on the table. When the dealer has a low card face up, there’s a better way to press home our advantage. Double down on any dealer face-up cards except 10 or Ace, and you have a better investment than splitting the pair. Let’s compare expected outcomes for our six-deck game if you have 5-5 and the dealer has 6 face up. If you double down, your expected profit per $1 of your original wager is 58.8 cents.

If you just hit, that expected profit is 29.4 cents.

If you split, the expected profit is 10.4 cents .

The weakness of starting a hand with 5 shows in decreased profit when you split the pair even when the dealer has a weak card face up. We make nearly six times as much money without any more risk when we double down instead of splitting. Just hitting isn’t the optimal play, but it brings nearly three times the return of splitting with less money risk. The emailer who started this discussion told me the play has been profitable for several years, and that when dealing himself hands and home, splitting looked like his best option. I’m not going to convince him, and that happens. Sometimes players have results outside the ordinary for extended periods, and if we don’t keep records, sometimes the results aren’t quite what our memories tell us. Nonetheless, the odds of the game tell us the best play for a pair of 5s is to double down against 2 through 9, and stand against 10 or Ace. It is not a close call.

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We'd like to think that IQ isn't the determining factor for success in life. But psychology professors David Hambrick and Elizabeth Meinz recently wrote an Op-Ed for The New York Times, "Sorry Strivers, Talent Matters," where they cite a few scientific studies that point to innate talent — not practice — as what separates the good from the great. This is a bummer for many of us who want to believe that putting in the work will yield successful results. And not to say it doesn't: it just can't compete with outright intelligence. Another unpopular idea is that of intelligence quotient (IQ) tests being an accurate barometer of a person's smarts (the Op-Ed also points out that SAT tests are pretty good measures of IQ).This all goes against recent thinking on the subject — including Malcolm Gladwell's thesis in Outliers, which says that hard work is a key predictor of one's success. As it turns out, many factors throughout our lives affect our IQ scores — and conversely, our IQ scores can greatly affect the outcome of our lives.

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