cEV and EV

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I've read a bunch of times that near the beginign of a tournament they're likt ethe same thing...

can anyone elaborate in this, i'm in an argument w/ my friend an di can't convincec him that he shouuld push edges early in a tournament... he says he's not worth twice as much when he dobules up.

He's a stubborn bastard and i can't elaborate on my thoughts tonight... any help?