Good point. It’s a tricky thing. I vary my opens a big depending on the situation. Mostly that has to do with my position, stack size, and the size the the blinds, and not the cards I’m holding.
I’ve found that the difference between getting 4-5 calls and getting zero can be 1BB, so sizing bets to isolate one player is kindof frustrating to me. If I’m consistently getting 4-5 calls at a given open size, I can see that as a sign that I need to increase my bet. If I do, though, I find that even a 1BB difference can just get the whole table to fold. I win the hand, which I don’t mind, but I only steal the blinds, which is usually not “enough” value for the cards I was betting. So… it can be tough for me to get the right bet in.
As well, if I am at a table where I know the right size to bet to induce one player or maybe two to call to see the flop, then that amount might already be too big for me, in that it tends to hurt too much to lay down if the flop is bad for me, and I feel that I have to win the hand or else I’m going to be in deep trouble for what’s left of this game. That’s a really bad feeling for me to have, because when I feel that way, I tend to try to force things, and that seldom goes my way.
So the “right size” open would ideally be something that I can fold if I really don’t like the flop, and yet something big enough that it gets enough people to fold preflop that I’m not facing 4-5 players in a pot. What size is that?
I also would like to size my open bet properly so that I have enough in my stack left to make future bets on upcoming streets. Those bets should be able to be sized such that they can (if I want) make an opponent think very hard about whether they want to continue in the hand.
This all gets much, much easier after I’ve won a few hands and have the big stack at the table. If it’s still early enough that my stack is roughly even to most of the other players, it’s quite a bit more challenging. (Which, I suppose, is obvious, elementary NLHE fundamentals, but it bears repeating).
Quite a bit of the time, I find in a 9-seat SNG game, I’ll enter into several hands that I feel are promising, losing them when they don’t pan out my way, until I’m down to a number of chips that I’ll call my desperation shove size. When I get to this point, I look for an opportunity to play a hand, shove all-in preflop with it, and hope that I get called, and that I’ll double (or more) up. My stack will be small enough that it will be fairly likely to get called when I do shove, and because I know this I guess I’m tightening up my range a bit more than previously. If I end up getting the right cards, and if I prevail, then I might end up making a decent run at the table and even get a win out of it. Going from 1200-1800 chips to 3600-5400 in one hand has a way of turning the tables in a way that going from 2500 to 5400 over numerous smaller hands doesn’t. The other way it can go, at desperation shove time, is that no one wants to call, I pocket a small pot that is still a decent percentage of my overall stack, and I may end up doing it 3-4 times, until suddenly I’ve essentially bullied the table with my back against the wall up to a healthy and even respectable position, where suddenly my aggression is feared, and by that time the blinds are usually up to 150/300 or so, we’re down from 9 players to 5-6, and 3-4BB raises tends to fold enough players so that I’m only facing down one.
This is where I feel the most comfortable and in-control. Maybe this means I should be playing 6-seater games, instead of 9. But I think what it really means is that I need to re-evaluate my early gameplan for a 9-seat game and close up some holes, and figure out how to play a stronger game early. Maybe it’s just a matter of tightening up my range, opening bigger to compensate, and staying out of most hands until 1-3 players have been eliminated.
I’ll have to experiment and see.