Re: General pot odds question
EDIT: Oops, I thought this was on the turn.
Depends on whether or not your A is an out and if the guy will pay you off if the flush card hits.
There are 47 cards left - 9 spades (provided villian does not hold any) = 38:9 the odds of hitting the flush on the river.
That reduces to 4.2:1.
With $400 in the pot and Villian folding to a flush card, then you can call no higher than $125 bet.
If Villian will pay you off on your flush, then all you need is for him to bet an amount that gives you the implied odds to win. So if Villian bets $300, he needs roughly $700 left in his stack and the willingness to part with it. More likely Villian might bet $250, in which case you will be getting 2.5:1 on your draw and provided you hit your flush, Villian needs to call about a $300 value bet to make it +EV.
There are other angles to consider as well since the 2[img]/images/graemlins/spade.gif[/img] can make a boat and if your A[img]/images/graemlins/spade.gif[/img] is clean you have another 3 outs.
btw - Never call an all-in on a flush draw without pot odds. I know that is not what you are asking, but I have been seeing a lot of people doing it lately and they are losing a lot of long term money by doing so.
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