5-10 NL straight flush draw

[Maulik]

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If you made pot sized raise on flop, you would just have one pot sized bet on the turn and you would already be all-in and not having to worry about folding the best hand here. But as played, it looks like a fold. Too shallow and you are showing too much aggression for him to really think this is a good place to bluff.

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$165 is roughly pot-sized, in spots like this I raise $200 or $250.

excuse me for asking but what is a PSB on the flop?