blackjack sidebet

Hi All,

I found an interesting sidebet in a casino near me: in case of Blackjack the payout is 20 to 1 (you bet 10 and receive 200), with any other point you lose the side bet.

Here the info about the table:

6 decks
Continuous shuffle machine :-(
No hole card
In case of dealer BJ you lost all the split and double bets (but there is no effect on the sidebet)
Split up to 3 times
Double down allowed only with 9,10,11

You may bet only 1 o 2 x the minimum bet on this sidebet, and you may access to the sidebet only betting on the main bet too.

I made some computes, and I think that this is one of the sidebet with the minimum house edge that I ever seen (under 1%). Am I right?

If so, according to you, there is a way to beat the CSM, maybe in the first seat? I’ve notice that the first card of the next round is already out of the CSM when the last card of the dealer is dealt. So, maybe only for this card, you may make estimate a dynamic probability to receive an Ace or a Tens? For instance in a round with 18 or more cards dealt (7 seats + dealer) without aces, the probability of a blackjack in the first seat could change a lot.

What do you think about it?

Best Regards,

df

If you know nothing and they pay out 20 on your BJ regardless of the dealer's hand and you keep your original stake then it's a very good bet with a HE about 0.27%. With some info, like knowing the last N cards weren't an Ace or Ten, then it gets even better!

I have a sneaky feeling they may only pay you 20 but keep your original bet as that would be nearer a typical sidebet HE.

Hi, thank you for your feedback.

Let’s make an example: The original bet is 10 euros and the side bet is 10 euros.

I receive a bj, and the dealer pay me 19x10 euros plus the 10 euros of the sidebet. So I have now 200 euros.

Than starts the normal bj round. And I receive 15 euros plus 10 if the dealer has not a bj. Or just 10 in case of bj (I can also accept even if the dealer has an ace)

Since they pay 19 and you keep your 1, that's 19 to 1.

Yes, you’re right. 19 to 1. I was not sure about the way to explain, that’s why I clarified with the example.

Do you think that the csm can be defeated with this sidebet?

Quote: donaldfra

Do you think that the csm can be defeated with this sidebet?

Under normal circumstances, no. But if you can find a dealer that deals many hands before inserting the discards back in, it might be possible. I'm not sure at which point the deck needs to be in order for the 19 to 1 payoff to be an advantage.

You've double posted this now, but I do think the side bet + bad game is good for people to see/learn in a new thread... My other response in the other thread:

Quote: SM777

I think the odds of getting a blackjack are just below 5% on six decks. Paying 20-1 is really fair for a sidebet.

Wiz Appendix:

"Let n be the number of decks. The probability of a blackjack is 2*(4/13)*(4n/(52*n-1)). If n=6 the probability is 192/4043 = 4.75%."

My thoughts are that they made a poor HE blackjack game and an attractive side bet. You probably have to bet at least the same amount on the BJ hand as the side bet. Thus, the combined edge of the two will I'm sure be negative. The rules he described above are for one of the worst blackjack games ever... though we don't know "all" of the rules we need to know.

donaldfra - check out this page and plug in ALL of the assoicated rules (H17 vs S17... early vs late surrender - or none, etc, etc). The HE of the BJ game is almost 1%... all this game would need is to pay 6:5 on BJ to really hammer it down as awful.

Quote: Romes

You've double posted this now, but I do think the side bet + bad game is good for people to see/learn in a new thread... My other response in the other thread:

Wiz Appendix:

"Let n be the number of decks. The probability of a blackjack is 2*(4/13)*(4n/(52*n-1)). If n=6 the probability is 192/4043 = 4.75%."

My thoughts are that they made a poor HE blackjack game and an attractive side bet. You probably have to bet at least the same amount on the BJ hand as the side bet. Thus, the combined edge of the two will I'm sure be negative. The rules he described above are for one of the worst blackjack games ever... though we don't know "all" of the rules we need to know.

donaldfra - check out this page and plug in ALL of the assoicated rules (H17 vs S17... early vs late surrender - or none, etc, etc). The HE of the BJ game is almost 1%... all this game would need is to pay 6:5 on BJ to really hammer it down as awful.

Romes, it pays 19 to 1, not 20 to 1.

Quote: Ibeatyouraces

Romes, it pays 19 to 1, not 20 to 1.

I saw that after posting... I was just putting my response from the other thread here.

Quote: Romes

I saw that after posting... I was just putting my response from the other thread here.

I have a whole page on side bets on a player blackjack. It shows that at 19 to 1 and six decks, the house edge is 5.02%. Too bad its on a CSM.