when?

[vmacosta]

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The answer to your original question is that you should often bet when you don't expect your opponent to fold any better hands and you expect to lose more than half the time. This occurs when you are OOP whenever the pot is big enough and your hand is good often enough that, if you check the river, it will be more profitable to call than to fold, but the villain will check behind most of the hands you beat.

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I know I promised to quit piling garbage into this thread, but I wanted to add something to this well-written post. The bet you are speaking of does not actually require that you be forced to call a bet if you check. Say if you check your opponent will bluff 10% in a 5BB pot. You will be best off folding. However, if your opponent has something better than you less than 10% of the time and he never raises a worse hand, then bet/folding is better than c/f'ig even if he will NEVER call with a worse hand.

I guess that's the same as a blocking bet.