Selective Aggression
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Playing aggressively isn’t natural. Consequently, students of the game are often trying to work in more aggression. It’s a good thing, with the usual caveat that they should use “selective” aggression. But what does “selective” mean, exactly? What situations do you select?
A lot of players who are trying to become more aggressive instinctively pick exactly the wrong situations to do so. They become aggressive when their opponents are being aggressive. They bet, get raised, and say to themselves, “I’m not going to let myself get run over again,” and reraise or push. Or their opponent bets, and they say, “I have a marginal hand that’d I’d usually just call with, but I’m going to raise with it this time to be aggressive.”
Here’s my rule of thumb. Aggression has the most value in poker when your opponents are checking. Your opponents are checking because they’re weak (usually). That’s when you have the advantage! You can bet into checking opponents and get them to fold the better hand. Or you can bet into checking opponents and get them to call with a weaker hand. If your opponents are checking to you, the chance of a positive outcome is much better. Aggression is most powerful, by far, against checking opponents.
When your opponents are showing strength, almost by definition, your edges are going to be smaller. So, if you’re trying to be more aggressive, it’s not about “standing up to the bullies.” It’s not about 4-betting that A6s preflop after you get 3-bet. It’s not about raising that QT on a Q-high flop. It’s about betting relentlessly against weakness.
[This post is based on a post I made on the Stoxpoker forum.]
Tags: aggression, limit-holdem, no-limit-holdem, poker, selective aggression

What about in games where there’s not a lot of checking? I’ve played in some crazy live (limit) games where it’s four-bet six way and guys are five-betting with J5o. There’s not a lot of “Well, he called me, so now I’ll give up” going on.
Here’s a hand I played last night. I had two red eights in the BB in a wild 8/16 game (as described above). Three callers, the button raises, he’s playing about 75% of his hands and (re-)raising all of them, so I 3-bet, folded to him (surprised me), he 4-bets, I 5-bet, he calls. Flop is A54 all hearts. He bets and, as with all other hands he plays, he starts separating raising chips from his stack.
My question is: here’s a situation where the guy is not going to not-check. He’s the type of player to bet and raise the whole way with a gutshot and an overcard. But I really think I should be raising *more* often than against someone who checks to me a normal amount of the time (I think I have the best hand most of the time, btw).