In all videos I hear times and times again - villains BU calling range, BB raising range, MP limp - call range etc etc. And here I feel I have a problem defining those ranges. Each time villain calls or raises I start thinking of overpairs or sets, no matter what had happened before.
Say, villain in MP2 (FR) calls 3x bb raise by UTG. What is his possible range? What is his range if he's 20 / 11? Or 12 / 9?
I suppose range's definitions is more of an art, not science, yet any help very appreciated. Is there some reading that might help?
Thanks