As I discussed last week, the arithmetic of “any two” situations suggests that even slight suspicions that your opponent is on any two cards can and should lead you to fight back liberally. This is especially true those times when your opponents might not suspect that you put them on a very wide range or when it would be very expensive for them to find out whether you are on a move.
This in turn suggests that it’s worth your while to improve your ability to learn your opponents’ “any two” propensities. Even if you don’t sniff many of these situations out, they are so valuable as to make the relevant skills worth developing.