I guess everybody knows the concept of a Nuts vs Bluffcatchers spot, also called Pair vs BC or polar spot, or range advantage spot.
It's a very important concept used in many teaching content.

For example, it is mentioned in Tipton's book as PvsBC.

My problem is that I can't find any precise definition of what such a spot is.

Everytime I ask a precise way to determine if a spot is Nuts vs BC or not, I am told an example.
For example : UTG raises, everybody folds until the BB who calls and the board comes 2c2s2h.
OK, this is a Nuts vs BC spot.

But many other spots are less black & white ones.

So in practice (no toy game, but real poker hands), how could be determine a spot is Nuts v BC?

I don't think the equity of both range is the key here, because I think it's more a question of range distribution (which obviously impacts the ranges equity, but you can't deduce the ranges distributions from the ranges equity, as far as I know).

I thought about this criteria : number of hero's combos stronger than overpair (so this includes overpairs, 2 pairs, sets, trips, monsters...) divided by number of Villain's combos stronger than overpair.

After studying a few Turn spots, I'd say when this metric is above 10 (?), then it's a PvBC spot.

Is that metric enough to determine a PvBC turn spot?
Do you think 10 is a right threshold?
What about the flop and river spots? Same metric? Same threshold?

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