DeathDonkey is in the well

[aK13]

Hey DD --

So I troll the High Stakes forums, and a really common theme there is "making big folds on the river for one bet" -- i.e. 4bet/fold to a 5bet with baby flushes, 1 card straights, 2pair, etc. and frequently a lot of posters argue both ways on the end (whether to call or fold to the 5)

What's your standard line against folding on the end HU in big pots? Or do you typically just get a "gut feeling/instinct"? Do you really feel like learning how to make these types of folds end up affecting winrates much?