Thanks for this thread. There's some good writing in here. It's helping me attempt to think about how I'm playing. Here are my thoughts on this.

Quote Originally Posted by bigspenda73
1. Opponent's stack-size
--20bb, 33bb, 50bb, 62bb, 100bb+. All of these stack-sizes could give us a lot of information on our opponent's PF tendencies. What are some generalizations we could infer from these stack-sizes?

If I'm up against a deep-stacked player I include a wider range of hands than I do if the player has a small-stack, giving the deep-stack more hands with drawing value. I've seen smaller stacks playing (gen. pushing) wide ranges though that's often through tilt. If they've been around a while, I'd tighten their range, excluding the lower end of drawing hands, including more higher card holdings, i.e. to a short-stacked player ATo is more in their raise to open than 87s, either in position or UTG.

For mid-stacks, 33bb-62bb I'd struggling to link their stack-size to their opening range much beyond a general range of solid hands OOP, getting wider with position.

2. Opponent's opening size
-limp,2bb,3bb,pot,4bb,5bb+. All of these initial PF raise sizes could tell us a lot about our opponents. What are some generalizations we could infer from these opening raise sizes?

It's rare I have good reads/stats available on the players at the tables I play, so without evidence I'm QQ+ limpers a tiny fraction of my range. If someone limps UTG I'm including small-mid PPs/mid-strong suited hands, still a wide range. In later position, players can open limp with a huge range.

I include a wider range of hands when a player raises 2BB than when they raise a bigger amount. Players generally know they need to be aggressive and look to steal, but they do so with a minimum raise with hands they are not comfortable with. I'd expect AA almost as often with an open limp than with a 2bb raise.

3bb/pot-sized raises I'm again unsure. It seems fairly standard so I cannot assign a specific range based specifically on their raise. I'd expect better hands to raise 4bb+ than 2bb+ without stats/evidence, so I have a tighter range of hands as my expectation.

3. Opponent's position
-EP,MP,LP,Blinds. All of these positions could affect our opponent's hand-range. How do we feel each spot affects their range?

EP I'm including a smaller range of hands, increasing from UTG to the BB. Players generally know about position and adjust, even if they do not realise they are doing so. If somebody open raises, I'm including a smaller range of hands than if they open-limp.

If I don't know anything about a player I'll err on the side of caution, but blinds can be very loose, playing almost any two cards, especially if there is a raise and/or a couple of limpers.

4. Re-raising and 3bet size
-An opponent's 3betting size could tell us a lot about them. What could we infer from different 3bet sizes?

Without any previous info. to go with a player, I tighen my range a lot when an opp. re-raises/3-bets. If I raise from EP and I'm called by the button, I can include a wide range of hands that the button is playing. If the button re-raises, even taking into account his position I'm still tightening up what I hands he can hold. I'm not suggesting I only see aces, but if it's the first time he's done it then I'm slowing up and looking at my next move carefully.

3-bet size is interesting. I'd put a large 3-bet on a tighter range than a smaller 3-bet, but I have no real reason to back this up.
Good thread. Keep it coming!