I think it's bad for beginners to flat out of the small blind, so maybe fold those. However, there comes a time when you'll be able to fold decent pairs postflop when you think calling is unprofitable and when that happens, I think you should call preflop.
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I think flatting them OOP sounds like a bad time vs a decent player.
It's not easy and I don't have data to back up my theory. Just because it's difficult doesn't make it unprofitable.
"nobody ever said the final boss was easy." - unknown
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So what happens when you coldcall in the small blind? Sometimes the big blind calls too, which makes it a somewhat protected pot. This makes it very difficult, read: unprofitable, to bluff for the in position player. This means equity realization for your 55, AQ, etc because if he's not bluffing then what's he doing? He's checking a lot. Then when he bets and you have a naked Ace high or a small pocket pair with multiple overcards on board? You fold easily. Not all beginners can make these folds easily thus they should just fold preflop.
Other times, you gotta play heads up vs a decent player. This isn't a very advantageous position and I don't claim to win a lot of money in these spots. However, I do believe that calling as I suggested is somewhat profitable. That's why I do it. Not because I'm bored nor for any bs metagame reasons. It's about winning money. I think I can win back more than my preflop investment. So when I'm heads up out of position vs a decent player, there are a few things that are gonna happen on the flop:
a) he's going to check back a lot on dynamic boards that hit my range hard. This is equity realization in pure form. My 55 will often be the best hand when this happens and my AQ will often hit a strong pair on the turn or river in addition to my raw showdown value. If and when he bets, I'll make a decision based on the size of the bet and how much equity I think I can realize on later streets.
b) he's going to bet a lot on static boards that hit his range hard. This is power poker in pure form. You know how some bad overaggressive players just love to spew no matter the board texture? Yeah, good players don't do that. They'll put tons of pressure on you on static boards for the prime reason that they have tons of strong hands to back up those bluffs. They're not gonna try to "trick" you. If they slowplay a big hand, it's not to be tricky or for the sake of a silly word like "balance" but rather it's because they recognize that it's the line with the highest ev. When they bet the flop, they know what they're trying to accomplish and they know how to accomplish it. However, all of that said, you get two cards to play, right? This means that you own a share of the pot, however small in some cases. If you're making good decisions, then literally every decision you make at the table will have an expectation greater than or equal to $$zero. It's the bad, unprofitable calls and the missed value with big hands that separates the beginners from the decent players. So put in some study with an equity calculator and see just how badly 55 does on the AT8 flop. Then consider how often those types of flops come up. Then when you're at the table, you may even recognize spots where it's correct to fold 55 or AQo in the small blind because you think calling and 3 betting are both unprofitable. That's when you know you're ready to call sometimes in the small blind. Not because I told you to, and not because you read it in a book, but because you believe it's profitable.