ISOing range versus Station

i don't understand this - can you explain a bit more plizz?

Say you're heads up oop in the bb against him, he limps in the sb and you raise to 3x, and he folds 57% of the time. Pretend that when he calls you always loose. Then your EV is:
- 57% of the time he folds and your profit is 2bb
- 43% of the time he continues and your loss is 2bb

so EV = 0.57*2bb - 0.42*2bb = 0.3bb

So even if you always loose when he calls, you still make a profit just with your fold equity.

Originally Posted by daviddem

EV = 0.57*2bb - 0.42*2bb = 0.3bb

Thx, i get the calc; trouble is, MMM appears to be presenting it as a one-size-fits-all solution, whereas, it's only the scenario you use as ur example that holds true.

e.g. if he open-limps in from CO and i ISO to 5bb (my "standard"), then

EV = 0.57*2.5 - 0.43*5 = -0.725

I'd have to drop my ISO raise to 3.3bb in this spot to make it +EV in a vacuum; is this something i should be considering?