I don't know how play this situation.

[suited_ace]

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You HAVE to bet after the flop here. And it have to be a reasonable sized bet (atleast 75% of the pot).

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On a A-rags-rainbow board you can achieve the same purpose with 50% of the pot. If the board was A-Q-5, two clubs, THEN you should bet about 3/4 of the pot.

You want to achieve a goal using the least amount of chips possible. If you're beat, you'll save yourself a few chips. In the long run those chips make a difference.