I wrote:
  
  >Well, just giving some rough estimates, straights are made about 1% of
  >the time.  There are 10 possible straights, so ace high straights
  >would be made about 1 in 1000 hands.  Of those, starting out with an
  >ace of any suit, to have the other 4 cards match its color would be
  >1/2 each, for a total of (1/2)^4, negligibly removing the royal
  >flushes.  So, it sounds like that hand occurs once in about 16,000
  >hands.  Getting 36 extra bets for it would add .225% to the overall
  >payback, making it something like 98.3%.  Strategy and other
  >adjustments, such as drawing to royal flushes more than each
  >particular straight flush, might add .1%.
  
  I think that .1% might be low, since by the reasoning I gave above for
  the frequency of the Red or Black Royal Flush, a royal flush would be
  hit only once in 256,000 hands.  I'll guess the overall payback with
  perfect play is 98.8%.
  
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