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Thread: Confused about SD/hand in BJA3

  1. #1


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    Confused about SD/hand in BJA3

    The risk of ruin tables in BJA3 on pp. 116-121 have me confused. I thought the SD per hand of blackjack varied a little with the count but was always approximately 1.1. The charts on these pages have SD/hand on the X axis and the range is 1.5-4 - how does SD per hand change that much and what causes that change?

    Best I can figure, the SD is being expressed as units, not as a multiple of the amount bet on an individual hand, and your spread determines which row you should reference since your average bet will be more units with a bigger spread. Am I close?
    Last edited by Optimus Prime; 11-16-2018 at 09:41 PM.

  2. #2


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    Quote Originally Posted by Optimus Prime View Post
    The risk of ruin tables in BJA3 on pp. 116-121 have me confused. I thought the SD per hand of blackjack varied a little with the count but was always approximately 1.1.
    That's for flat-betting (1.15). It's larger when you spread.

    Quote Originally Posted by Optimus Prime View Post
    The charts on these pages have SD/hand on the X axis and the range is 1.5-4 - how does SD per hand change that much and what causes that change?
    See above.

    Quote Originally Posted by Optimus Prime View Post
    Best I can figure, the SD is being expressed as units, not as a multiple of the amount bet on an individual hand, and your spread determines which row you should reference since your average bet will be more units with a bigger spread. Am I close?
    Bingo!

    Don

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    Awesome. Can I also assume that SD/hand = (SD/hr)/(hands/hr)?

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    Quote Originally Posted by Optimus Prime View Post
    Awesome. Can I also assume that SD/hand = (SD/hr)/(hands/hr)?
    No! For shame! SD is a square root function. If you play 100 hands/hr., hourly s.d. is TEN times s.d./hand, not 100 times.

    Don

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    Ah. Right idea (relating hourly to per hand) but wrong formula.

    I appreciate the correction Don. It’s not every book that comes with author support at no additional charge!

  6. #6


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    Quote Originally Posted by Optimus Prime View Post
    Ah. Right idea (relating hourly to per hand) but wrong formula.

    I appreciate the correction Don. It’s not every book that comes with author support at no additional charge!
    My pleasure.

    Don

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