How Many Decks Casino Blackjack

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Casino blackjack how many decksAt least six casino blackjack how many decks casino blackjack how many decks to eight decks of cards are used leading to a game of about 416 cards and 96 face cards, shuffled and reshuffled well for each round of blackjack. Casino blackjack how many decksPosted September casino blackjack how many decks 15, 2015 by Ken Smith Fewer Decks are Better. Skip to the content. We Offer 0% Interest-Free Financing. Meet Your Private Jeweler (Virtual Consultations) Schedule a Visit; 214-466-1776.

Introduction

In playing blackjack online one problem I often face is not knowing how many decks are being used. This is a particular problem with Real Time Gaming casinos. The help files often do not indicate this rule, as well as other rules, and customer support are notorious for giving incorrect information on their own rules. So I devised a test to help determine the number of decks. This test is based on the player's first two cards and the dealer's first two.

How many decks in blackjack casino

The following table shows the probability for various configurations of the initial four cards in blackjack. Note the probabilites for a suited pair. Of all the hands I feel this is the best to test for, given both it's frequency and correlation to number of decks.

Counting Cards Single Deck Blackjack

4-Card Hand1 deck2 decks4 decks6 decks8 decks
4 singletons0.6761100.636920.6185040.6125300.609573
Non-suited pair0.3042500.2866140.2783270.2756380.274308
Suited pair0.0477690.0695820.0765660.080006
Two non-suited pairs0.0103720.0097710.0094880.0093970.009351
Two suited pairs0.0002710.0005930.0007250.000796
Two pair - 1 suited0.0032570.0047440.005220.005455
3 of a kind - 3 suits0.0092200.0086850.0084340.0083530.008312
3 of a kind - 2 suits0.0065140.0094880.0104410.010910
3 of a kind - 1 suit0.0005270.0007730.000909
4 of a kind - 4 suits0.0000480.0000450.0000440.0000440.000043
4 of a kind - 2 suits (3&1)0.0000330.0000480.000057
4 of a kind - 2 suits (2&2)0.0000170.0000370.0000450.000050
4 of a kind - 3 suits0.0001360.0001980.0002180.000227
4 of a kind - 1 suit0.0000010.0000020.000003
Total11111

To determine the number of decks in an online blackjack game keep a tally of both the total number of hands played and the number of suited pairs. Only count a hands as a suited pair if the other two are singletons. For example one suited pair and one non-suited pair does not count. In a single deck game the ratio of suited pairs to total hands will obviously be zero. In double deck this ratio will be about 4.8%. In a 4-deck game the ratio increases to 7.0%. After that the differences are too subtle are to tell without a gigantic sample.

Blackjack

How Many Decks In Blackjack Casino

Of course if you ever notice three of the same card on the screen at once that rules out a double deck game immediately. Despite my lack of faith in customer support knowing their own rules I would suggest at least asking. If they give you an incorrect answer, and you can prove it, you may get some free money in your account as a way of thanks. This has happened to me several times.

Unfortunately it takes a fairly large sample size to have confidence in the number of decks between 2 and 4. After 250 hands the probability that the sample mean in a 2-deck game will be greater than 6.96% (the 4-deck theoretical mean) is 5.29%. Likewise the probability that the sample mean in a 4-deck game will be less than 4.78% (the 2-deck theoretical mean) is 8.76%. Increasing the sample size to 500 these numbers become 1.11% and 2.76%. At 1000 the numbers are 0.06% and 0.34%.

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Written by: Michael Shackleford