Re: 4 to Flush on Flop When To Bet and Check/Call?
If you have 4 to a flush on the flop, that means that there are 9 of the suit still out there. So far you have seen your two cards and the three on the flop, for a total of 5, meaning that there are 47 yet to come. Nine of those make your flush. That means the odds are 9:38. Of course, you get to see two more cards, making the odds (9:38)+(9:37) = 38.7% chance of your card coming (please check my math). Translated to odds, that's 38.7:61.3, or about 1:1.6. So if you think (or know) that at least two other people will be seeing the turn no matter what you do, you should probably be betting, raising and re-raising your flush draw.
If it doesn't come on the turn, you are still getting 9:37, or just over 1:4, so you should probably take a free card if you are in position to do so, unless there are still 4 or 5 other opponents in the pot and you think they'll call.
You are not always going to make your flush, but betting your draw when you are getting odds to do so is +EV.
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