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Frequent blackjack questions31 July 2014
So let’s do a little blackjack FAQ, with a few of the things you ask most.
Let’s say you encounter a single-deck game where the dealer hits soft 17, you’re allowed to double down only on two-card totals of 10 or 11, you can split pairs only once with no resplits, and you may not double down after splitting pairs. That’s a host of negative rules, and brings the house edge against a basic strategy player to 0.44 percent.
Now let’s say the same casino offers a six-deck game where the dealer stands on all 17s, you resplit pairs up to three times for a total of four hands and you can double down on any first two cards, including after splits. The house edge is 0.40 percent, lower than in the single-deck game.
One of my local haunts used to offer that six deck game and also permit late surrender, dropping its edge to 0.33 percent.
You have to weigh all the rules, not just the number of decks. That said, there is one deal breaker. If blackjacks pay only 6-5 instead of 3-2, it increases the house edge by 1.4 percent, more than triple the entire edge of the weakest game detailed above. No matter how many decks are in play, avoid games with 6-5 blackjack payoffs.
Let’s say the first card you’re dealt is an Ace. After all, if we’re to get a blackjack the first card must be either an Ace or a 10. In a single-deck game, 16 of the other 51 cards are 10 values. That means 31.37 percent of the remaining cards will complete the blackjack. If six decks are in play, removing an Ace means 96 of the remaining 311 cards are 10-values. That’s 30.87 percent, meaning you have a lesser chance of completing your blackjack in a six-deck game than in a single-deck game.
Without going into all the arithmetic, your chances of the second card being an Ace when your first is a 10 also are higher with fewer decks, as are your chances of drawing a 10 when your first two cards are in double-down territory.
When the dealer hits soft 17, he can turn the hand into 18s or better, and even if he draws a 5 through 9, it doesn’t bust; it just puts him in 12-16 territory for another hit. On balance, the dealer will beat you more often if he risks the occasional bust in exchange for chance to build better hands.
That doesn’t mean everyone should run out and look for continuous shufflers. Quite the opposite. The positive effect of having all cards available in the shuffler instead of in a discard tray is minute, decreasing the house edge by only 0.02 percent.
The big tradeoff that with no play stoppages for shuffles, there are more hands per hour, and more chances for the house edge to work against you.
Let’s say you’re a basic strategy player betting $10 a hand on a game with a 0.40 percent house edge that drops to 0.38 percent with a continuous shuffler. And let’s say you’re at full table, averaging 50 hands per hour at a hand-shuffled game, 60 with an automatic shuffler with play stoppages to change decks, and 70 with an automatic shuffler.
Per hour, you risk $500 and average $2 in losses at the hand-shuffle game, risk $600 and lose $2.40 with the regular automatic shuffler, and risk $700 and lose $2.66 with the continuous shuffler.
The house edge doesn’t increase with the shuffling machines, but they make a little extra dent in your bankroll nonetheless.
Look for John Grochowski at www.casinoanswerman.com, on Facebook (http://tinyurl.com/7lzdt44) and Twitter (@GrochowskiJ).
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