[jjacky]

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preflop: i think this play is horrible. you are only a slight favorite over a random hand and there are 4 players yet to act.

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It's not horrible. He's about a 3-to-2 favorite over a random hand. That doesn't matter anyways because we're not all-in. Villian he's attempting to isolate plays poorly HU and that's a good enough reason for me to take a shot here.

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yes, he is a SLIGHT favorite over a random hand, but that's NO reason to raise. even a super weak and very loose player has an above average hand if he limps UTG (even if he folds only the worst 30% of his hands, he will have a random hand beat most of the time).
that means, even if hero succeeds in isolating the weak player, the average profit would not be very high. but if any other player enters the pot (most of the time with a raise) hero will be a big dog and lose much money.