What is your default range for calling 4bets OOP HU? According to one succesfull HU player, you should call nearly always even with very weak hands like 94s because you are getting good odds and you lose more if you fold than if you call. The only caveat being that you should not do this if his range is extremely strong.
What do you guys think? If you agree with this point of view, how do you justify it? Any calculations?