Let?s say you are playing hold?em and are currently on the flop, having a flush draw. Your opponent is most likely to have at least a high pair. The cards you should concentrate on are the outs, the nine cards that can give you a flush once you already can see four of the cards that will be used in your flush. The chances to get the card you need on the turn or on the river are of about 35%, or 1:2 for you, so in order to be sure you are making the right choice, you calls on the flop should be made only if they are based on 2:1 pot odds.
The implied odds
The term of implied odds asks for a calculation of the pot you are most likely to win if you do win. The implied odds are relative and dependent on the evaluation that you provide the game with. They are the relation between the actual size of the pot and the expected final size of it. Let?s consider one player bets in a limit game $5 and the pot is $20, so if you call your implied pot odds would be of 5:1 because you are betting a fifth of the expected winning. This is where we should tell if your opponent is either going to call or raise later on the game. Then the implied odds can get to 6:1 or 8:1 depending on the future bets that you must predict.