[jgunnip]

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So if someone has a high VPIP and low PFR that means he's a calling station? How do I expolit that? So I should raise less because he calls too much?

If someone has a high PFR I should be 3 betting them more or calling in position to take it down?

I'm thinking % to steal is a good indicator whether or not to 3 bet also. How high of a % does it need to be for you to be 3-betting him with crap? If I see him 4-bet me alot does that mean I should 3-bet him less and only with premium cards?

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VPIP and PFR are just preflop numbers. you could have a 50/0 that loves to raise every flop no matter what. This guy definitely wouldn't be a calling station. Aggressive preflop players generally have a PFR that is within 2-4% of their VPIP. Somebody whos VPIP is twice that of their PFR ie 18/9, 24/12, 34/17 tend to be more passive since they are calling as much as they are raising preflop. A 80/40 is just a maniac.

Not all players play postflop like they do preflop. some TAGs (16/14 ish) are quite passive postflop while some fish (40/2 ish) like to play the flop and turn very aggressively. Figuring these things out for different players is key. Postflop aggression gives you somewhat of an idea here. Also the fold/call/raise cbet stat is very helpful. Some players, both good and bad, will float (call you lightly) your cbets on the flop but fold a high percentage of the time on the river.

Another preflop thing comparing a players PFR with their attempt to steal %. Some players Stl% is twice that of their PFR, hence they are pretty tight and straightforward from UTG and UTG+1 (and most likely positionally aware), but are very aggressive in position. These of the types of players you might look to 3bet. Against a 20/18 players who steals 19% of the time you generally don't want to 3bet this player lightly, however against a 16/14 who steals 29% of the time you can probably widen your 3betting range.

As for 4 betting, at 25nl and 50nl you won't run into very many opponents who will 4 bet you light. I do it rarely when its obvious so aggrotard is 3betting me with a huge range. However you don't want to widen your four betting range too much. 88+ AJ+ would be a loose 4 betting range for the lower stakes.

Hope some of that made sense