Quote Originally Posted by Erpel
Btw the original question is not a way ahead way behind situation. It's a slighty ahead, way behind situation and therein lies all the difference. So if you have 10% equity 50% of the time and 65% equity 50% of the time you have a combined total of 37.5% equity - i.e. you are behind his range so checking is correct (as your EV calc showed)
I have 10% equity 50% of the time and 80% equity (not 65%) 50 % of the time. So my combined equity is 45% and I either have a big equity or a small one, does that not make it a way ahead / way behind situation? Or put another way, am I not up against a polarized range?

We're on the turn, not the flop, so with an overpair against a flush draw (1 card to come), 80% is about right. I made a mistake in the 10% equity against the set though: it should really be closer to 5%.

I understand the bit where checking is correct when I am behind the range altogether, even if that implies giving free cards to draws. Thanks for clarifying that, that was the whole point of my original question.

Please take a look at the JJ hand I linked to above, I think it is a practical situation similar to the theoretical one in this thread. Would like to hear your opinion on that one.