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Thread: 'Session' bankroll ROR

  1. #1


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    'Session' bankroll ROR

    I recently used the online calculator titled 'Risk of Ruin Given No Goal but a Time Constraint (Trip Ruin)' at https://www.qfit.com/blackjack-calculator-c3.htm to calculate my ROR for a 'Trip':

    I used a 400 unit trip bankroll (unit value $5) and a win rate of 2.0 units per 100 hands. I figured a trip to be ten 'sessions' of 150 hands each. Assumption of 75 hands per hour x 2 hrs. = 150. My 'Trip' risk of ruin calculates to:

    400 Trip Bankroll units
    2.0 Win Rate in units per 100 hands
    57 Standard Deviation per 100 hands: 1.14 x SqRt of 100 x $5 (unit value) = 57
    1,500 Hands played (10 sessions at 150 hands each for 'Trip')
    1.7% Risk of Ruin

    (Please confirm that I have calculated the correct Standard Deviation of 57. I got this from BJA 3rd edition page 16.)

    My question is: Does it make sense to even calculate a 'Session' ROR? You would just utilize the same calculator but use 40 'Session' bankroll units and only 150 hands? Does the small number of hands render the ROR calculation not really meaningful? I ask this because I get a ROR of 55% per session.
    Or maybe ten sessions are too many? Five sessions with 80 units/session drops the ROR to 24%. However, this seems like a small number of sessions for a 'Trip'.

  2. #2


    1 out of 1 members found this post helpful. Did you find this post helpful? Yes | No
    You can't do the standard deviation your way. First of all, when you spread, rather than flat bet, the s.d. per hand is much larger than 1.14. So you have to simulate to get the correct (larger) value. Second, you're using UNITS for all the inputs. You can't switch to using $5 for the s.d. calculation. That has to be in UNITS as well. So forget the $5.

    Use the methodology on page 20, not 16. Don't bother with single session RORs. You can't calculate them properly anyway, until you get the s.d. correct.

    Don

  3. #3


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    Just bring as much cash with you as you can. You never know why you might need it

  4. #4
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    Or simply a credit card.

  5. #5


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    Quote Originally Posted by Phoebe View Post
    Or simply a credit card.
    No, no, no. Credit cards have names on them. Possible Exception - a card with a different name than yours, but still under your payment responsibility.

    I have such a card printed with my first and middle name only.

  6. #6
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    Isn't a credit card always a withdrawal card at an ATM too ? In France always. And all the casinos that I know have ATMs

  7. #7


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    Quote Originally Posted by Phoebe View Post
    Isn't a credit card always a withdrawal card at an ATM too ? In France always. And all the casinos that I know have ATMs
    There was some discussion on this point a few years ago. Casinos likely have some sort of access to cards at ATM machines. Even if not, EITS can certainly read th3 cards from overhead cameras.

    It is a BAD idea to use ATM’s at casinos. Don’t do it. I’ve p,aged for many years, and I have NEVER used a debit or credit card in a casino.

  8. #8


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    Getting additional cash from an ATM machine (at a bank or shopping center not belonging to a casino) is an option for foreign players,
    who can only carry 10'000 dollars at most in a plane without getting into trouble. Maybe it would be wise to carry only 5000 dollars at arrival when hoping to win some money, so even when doubling the bankroll, it would be still possible to fly back unter the 10'000 radar.
    Last edited by PinkChip; 10-02-2019 at 06:11 PM.

  9. #9
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    Not sure if it works for foreign players but the walmart money card is a nice item to have. you can put $1100 cash onto it at any walmart it has a $3 fee but it helps to limit the amount of cash on you after a win and you need to travel. Of course a walmart needs to be near by for it to be useful.

  10. #10


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    How do you create the box around the text you want to specifically reply to? This is my second post ever so in addition to obviously not understanding S.D., I am not well versed in navigating around a forum. Appreciate your patience.

  11. #11


    1 out of 2 members found this post helpful. Did you find this post helpful? Yes | No
    If you want to quote the entire text, just click the Reply With Quote box.

    If you only want to quote a portion, highlight that portion with you mouse, then a little Quote box will pop up just to the right of the highlighted text. Click on it.

  12. #12


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    Quote Originally Posted by 21forme View Post
    If you only want to quote a portion, highlight that portion with you mouse, then a little Quote box will pop up just to the right of the highlighted text. Click on it.
    Got it. Thanks.

  13. #13


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    Quote Originally Posted by 21forme View Post
    If you want to quote the entire text, just click the Reply With Quote box.

    If you only want to quote a portion, highlight that portion with you mouse, then a little Quote box will pop up just to the right of the highlighted text. Click on it.
    Don’t think ive ever had that ability of partial quote off of my iPad. I go the long way by deleting text.

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