Reverse Implied Odds
Implied odds explain situations when your odds are better than they seem. There are other times when you must realize that your odds are not as good as they seem. These situations occur when you have a mediocre hand with little chance of improving, which you think is the best hand at the moment, yet your opponent keeps betting. You think he may be bluffing, and you can beat only a bluff - that is, a hand that is weaker than what your opponent is representing. However, since your opponent is controlling the betting, he will probably back off on later rounds if he doesn't have you beat. Thus, you are in the position of winning the minimum if you have the best hand but losing the maximum if you have the worst hand. The true pot odds in such situations are much worse than they seem, and so we call them reverse implied odds.

For instance, there is $50 in the pot, and your opponent bets $20. You think you have him beat, but you are not sure. You also have little chance of improving. You cannot say, "I'm getting to-20 odds here," because your opponent may come out betting again next round if he has a better hand than yours - or if his hand improves to a better hand - but he is likely to give it up if he has a worse hand than yours. You are in a situation where, if you lose, you figure to lose not just the $20 you are calling right now but a total of $60. However, if you win, you'll probably win only the $70 in the pot right now because once your opponent sees you're committed to the pot, he won't bet further with the worst hand. All of a sudden, then, you're not getting 70-to-20 odds but closer to 70-to-60.

Actually, reverse implied odds of 70-to-60 represent the worst possible case of such situations, as they come up in practice. If, for instance, you are sure your opponent will not bet again without a good hand, then you should obviously fold if he does bet again. So you have risked only $20 and not $60 to win $70. Conversely, if there is some chance your opponent will bet once or twice more without the best hand, then when you continue calling, you are risking $40 to win $90 or $60 to win $110, depending on how many times he bets. You are risking $60 to win $70 only when you plan to call to the end if your opponent bets, even though you assume you have little chance of winning if he continues betting.
Aggression and Your Cards
Some players think of aggressive betting as a way to "protect your hand," a bet they won't call so they can't catch a card that can beat you. Players who think this way will often end up playing passively because "they won't fold anyway" This is not a good way to think about things.
When you bet with the best hand, sometimes you prefer that they fold, but sometimes you do better if they call. When you're betting with the best hand, what you prefer they do depends on the combination of the size of the pot and their chances for improvement to a better hand. It depends more on their hand than on your hand.
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