1. Vegas Fanatics wrist bands are here! Check out this thread for details: Vegas Fanatics Wrist Bands!
    Dismiss Notice

Double deck or Six deck strategy

Discussion in 'Table Games' started by AcesnFaces, Sep 3, 2017.

  1. AcesnFaces

    AcesnFaces Bronze
    Founding Fanatic

    Messages:
    19
    Likes Received:
    75
    So you walk up to a 6 deck BJ game and 4 decks have been dealt. You have no idea which cards have been dealt or are left.
    Does it make sense to use 2D basic strategy instead of 6D basic strategy? For example why not double on 9 vs 2, which is what 2d strategy calls for?
    Seems logical to me but am I missing something?
     
  2. IOWActuary

    IOWActuary Bronze

    Messages:
    11
    Likes Received:
    6
    The bottom 2 decks are no different than the top 2 decks expectation. The distribution is still that of a 6D shoe, so play six deck strategy.
     
    Chuck, rycelover and tringlomane like this.
  3. tringlomane

    tringlomane Palladium
    Founding Fanatic

    Messages:
    3,649
    Likes Received:
    4,036
    You worded it way clearer than my head did.
     
    IOWActuary likes this.
  4. AcesnFaces

    AcesnFaces Bronze
    Founding Fanatic

    Messages:
    19
    Likes Received:
    75
    I figured that was the correct answer, and the fact that you're and actuary re-enforces it!
    I still can't quite get the "why" but I'll take your word for it...and keep using 6D strategy.
    Then again, math was never my strong suit!
    Thanks
     
  5. Chuck

    Chuck Gold
    VIP Pledge Member Founding Fanatic

    Messages:
    745
    Likes Received:
    1,079
    Don't think of it as having 2 decks left in a 6 deck shoe.

    Think of it as having 104 cards left in a 312 card deck, and play a "312 card deck strategy" (ie. 6 decks).
     
  6. IOWActuary

    IOWActuary Bronze

    Messages:
    11
    Likes Received:
    6
    Eesh - I would put less credibility on actuaries always knowing what they're talking about!

    It's a little complicated to get into the math - but it has to do with card displacement. Here's an example that doesn't have to do with strategy but illustrates changes in equity:

    In a new 2D shoe, if you get an ace, the odds of getting a ten for your blackjack are (4*4*2)/103 = 31.068%. For a new 6D shoe, if you get an ace, the odds of getting a ten for your blackjack are (4*4*6)/311 = 30.8682% - slightly worse than 2 decks. The difference is solely due to the relative effect of card removal of that one ace.

    In your situation, that card removal from 2 decks doesn't have the same effect. Removing an ace from the 2D left of 6D doesn't mean there are exactly 7 aces left. In fact, on average, there are slightly more than 7 aces left in that pile. From the remaining 103 cards, any card from the entire 6D shoe except for that one ace you have could be in those 2D, meaning that there are 23 remaining aces out of 311 possible cards of which 103 randomly comprise the remainder of your shoe. This means that on average, (23/311)*103 = 7.617 aces are left in the shoe, meaning your odds of blackjack are lower than that of a new 2D game.
     
    rycelover likes this.
  7. AcesnFaces

    AcesnFaces Bronze
    Founding Fanatic

    Messages:
    19
    Likes Received:
    75
    Now I got it Iowa.
    Thanks for the expanded explanation.
     
  8. topcard

    topcard Resident Downtown Low-Roller
    Founding Fanatic

    Messages:
    170
    Likes Received:
    181
    ...also, one has to factor in the impact of the cut... that's what, in 6-deck? Two-decks cut-away?
    In a two-deck pitch game, they cut away about half...in the two -deck shoe games, they cut away about 1/3.

    In any event, I agree with the others here - play BS as you would with a 'new' 6-deck shoe...or, better still, wait for the shuffle!
     
Loading...

Share This Page

  • About Us

    Vegas Fanatics was created from the vision of two Vegas enthusiasts to form a Vegas focused message board where we can feature what we believe are the most valued benefits of forum membership!


    Our mission is to connect Vegas lovers to relevant information such as trip reports, gambling information, reviews, and other experiences in a socially engaging way!


    © Chic Monkey Media, Inc. 2016-2017