When is the perfect play to bet the smallest amount that won't be called?
I'd have said this is what we are looking to do when we continuation bet bluff. By this I mean, after showing aggression PF, on certain board textures that we probably have the worse hand (e.g. our AQ misses a KJ2 flop, opponent might fold AJ or TT say), we want to bet the smallest amount possible that won't be called.