[ike]

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But cold calling with a hand that should be folded is not mixing it up, it's -EV.

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This is not a meaningful distinction. Mixing it up is -EV. One way of playing any given hand has the highest EV and playing any other is -EV. When this loss of EV, that is (EV of best play) - (EV of play you make), is less than you think the future gain of altering yor image is you make the play. The cross from positive to negative EV is irrelevant.

Oh, I also don't call the two cold here. But I still thought this point was worth making. How you think about the game is alot more important that what decision you reach in one situation.