Quote Originally Posted by Vinland
what do you consider marginal hands? TP? or less?
Against a 36/3, TPGK is a 'good' hand. Against a 10/9, TPTK is often marginal. Mid PPs with an over on the flop are a good example of a marginal hand too. They are easier to play in position, and a lot easier against tighter players (smaller range pre flop makes it much easier to know where you are post flop). OOP against a tight player sometimes you have to check the flop - if they will only call a c-bet with hands that beat you, then there's no point taking down a dry flop when you could induce a bluff on the flop or turn and gain a few bb's in the process. The more draws on the board though, the more you should be inclined to bet. Against stations and floaters, c-bet away. Crucial to playing these marginal hands is your opponents' tendencies, and the following thought:
"If they will only call with hands that beat you, don't bet. If they will call with worse, then bet."
Of course sometimes you'll want to take the pot down right there, so it's all situational.

Quote Originally Posted by Vinland
I have a problem spotting bad bluffs at 2nl. I believe they dont happen often, but then its tough to say b/c you dont get to see their cards after you fold.
What sort of things do you look for to spot a bluff?
Well, floating c-bets is a good way to start. Lots of people just can't seem to fire that turn barrel. Ranging your opponent down every street will help a lot, and one of the $2nl classics is people will bluff small (minbets or 2xbb) and value bet big, helping you spot the difference with ease. Still others will do it the other way round, just look out for it.
Again, tighter players are far easier to spot because their starting range is so much smaller. If someone running at 16/14 opens from MP2 and you call from CO, flop comes 993 rainbow and they c-bet, a re-raise here can be a good move because the chances that they've caught 9's, treys, or an overpair is so small against their range (22-AA, A10s+, Ajo+). Can't do it too often or they'll catch on, but that's just one example I can think of.
Watch for people who will auto-bet IP if checked to, and often loose-passive fish preflop will bluff too much post-flop. Pick up on these tendencies, each fish is unique but they can all be trained to jump through your hoops.

I'll drop in some bad bluff HHs on my next post.