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?

20bb- Usually really bad players. The may tighten up due to the short stack, but their range is still probably really wide. I've noticed these players tend to limp fairly wide ranges, and are still not shy of calling raises either. These are very often players just trying to double up and get a big stack for little initial deposit, so they play lots of hands and try to hit gin on the flop.

33bb- Very similar to 20 bb, and might be a 20bb player who doubled up. A greater chance it's a tighter player who got beat and didn't reload.

50bb- The higher the stack, generally the tighter the player is I think. I still don't give much respect to a 50bb player b/c it's extremely unlikely they're intentionally shortstacking, but it's now getting into the "protect my stack" range a little.

62bb- I think I see 75bb players more often, but it's about the same. They are, again, more likely to be tighter and could very easily be pretty TAG players. If they are tight, they are probably less willing to stack off with marginal hands (2nd pair and stuff) so they're conceivably calling with fewer 2nd pair making hands like J9o.

100bb- Could be a good player. Could have just started the session. I usually check these players to see how many tables they're playing, which obviously changes my perception of them. 5+ tables and they're probably not getting too out of line preflop. A few tables don't really mean that much, though I have noticed that most really bad players are only playing one table at a time.