More advice on bet sizing on later streets. Preflop and flop are more standard, turn and river get a little more important. After all, the pot is generally bigger and therefore the bets are generally bigger, making those streets more important.
First off, this is going to sound obvious, but think about what you are trying to accomplish with your bet before you make it. I mean, really pause and think. What specific possible opponent holdings are you trying to target?
When you boil it down, you're only trying to accomplish one of two things when you bet.
- Get your opponent to fold a better hand
- Get your opponent to call with a worse hand
There are other nuances, namely blocking bets to try to draw cheaply, and protection bets to try to take the pot down when you have a vulnerable but likely winning made hand. These two obviously don't apply to the river though. I am not a believer in betting or raising to "find out where you're at".
So, based on which of the two objectives you are trying to accomplish, think about exactly what hand you are targeting.
For example, if you have AK and the board is K T 9 4 4, you might bet the river for value. But specifically you're doing it because you think you can get called by worse. The hands you are targeting here are KQ, KJ, AT, QQ, etc. If this is the case, and that's what you're trying to target with your bet, you want to bet the most you think they will possibly call with those hands. In this example, you probably don't wanna bomb a pot sized bet because lesser hands likely won't call it.
If you have AK and the board is Q J T 6 2, you have the nut straight, and you'll obviously want to bet it for value. Here you are targeting AQ, AA, KK, QQ, JJ, TT, QJ, QT, K9, 89. A lot of hand combinations that will call a bigger river bet, so size accordingly.
If you have AT and the board is A K 9 9 3, really what you have here is more of a bluff catcher. What specific hands can your opponent have that they will call with? AK, AQ, AJ, A9 all beat you. Any other ace chops with you. There are just not that many worse hands that your opponent will have with which they will call a bet, so I'd likely opt to check back here (or check/call or check/fold out of position depending on opponent).
Same story on the bluff side. If you're trying to push your opponent off a hand, think to yourself what specific hand you're trying to get them to fold.
If you have QJ on an A 9 9 4 3 with three hearts board, and you decide to bluff (because you read your opponent's hand as mediocre strength), what are you trying to get them to fold? It is reasonable that a good player will fold an ace to your bluff that is disguised as a value bet. So tell yourself "I'm going to try to get him to fold AT", and bet an amount that would fold out that hand. There is no sense in trying to bluff out your opponent's ace by betting 1/5 the pot cause they won't fold. Yet I see players do it all the time at lower limits.
If you have AK on a J J T 9 3 board with 3 hearts, and your opponent has been calling you on other streets, it's likely they have trips, a straight, or a flush. So I wouldn't even bother bluffing here usually, because you're not going to accomplish your goal of getting them to fold very often.
Hand reading just becomes so important when sizing. You're probably not a great hand-reader yet, but at least have some conviction with your bet...do it to accomplish a specific objective.
Another important concept when bluffing is realizing what you can realistically represent.
Level 1 is playing your own cards
Level 2 is considering what your opponent might have and acting accordingly
You really wanna get up to level 3, where you are also considering what your opponent might think you have, i.e. what are you representing.
Maybe I'll talk more on that later cause I wanna go hit the tables!