This is a discussion on backdoor flush/straight odds within the online poker forums, in the Learning Poker section; hi, ive just started learning pot odds and outs. ive got the basics down, i.e 9 outs for a flush 8 for a straight etc....but 


#1




backdoor flush/straight odds
hi, ive just started learning pot odds and outs. ive got the basics down, i.e 9 outs for a flush 8 for a straight etc....but how do you calculate pot odds for a backdoor straight or flush?....or do you wait to see what comes on the turn first then make a one card decision...thanks

#2




The probability is 1 chance in 24 according to this site:
http://www.expss.com/poker/probab.htm 
#7




Say for example you want a backdoor diamond FD you would need a diamond on the turn and the river. The card that comes on the river is independant to the card that comes on the turn so we can use the formula P (A and B) = P(A)*P(B)
So say you have Jd5d on a 3d4c8h board to calculate probabilty it is just the chance of a diamond on the turn (10 in the deck of 47 cards) multiplied by chance of diamond on river (9 in deck of 46 cards). So (10/47)*(9/46) = 4.16% or 25/1. Same can be done for BD straights. I wouldn't worry too much about thinking about your BDs in real time. Sometimes the extra 4% equity leads me to jam some flops but I play a primarily shortstack game so I'm thinking about my current equitywith jamming so BDs are relevant. When you play a few more street your immediate equity isn't really as relevant (although it is obviously still relevant) since you still have more money behind and you think more about how turn cards change your equity. I can sometimes float some boards with BD draws but at an early level in poker I take it more on a street by street basis and wouldn't really give thought to multistreet plans. Not sure I'm putting across what I mean as eloquently as I'd like. Not 100% sure my explanations look sound. I'm good at Maths and Science, not things like English that involve good writing skills lol. 
#9




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