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Re: two-part question - pot control and fighting off draws
 Originally Posted by Blinky
To make matters worse, it seems that often by the turn the stacks are insignificant relative to the pot and, being out of position, you're kinda screwed on the turn ( don't have enough money for a potsize bet, again).
None of the replies above consider this issue of stack sizes, which I think is rather important. If stacks are deep then by all means bet hard to drive out draws and reduce their implied odds.
But if your stack is less than the pot on the flop then even if you push a flush draw has odds to call, with the result that you just lose more chips then you would have if you had just checked and then folded if the flush hit on the turn.
Consider the following hypothetical situation: you have made a hand on the flop, and for some reason you know that your opponent is on a flush draw which we for simplicity assume has a 1/5 chance of hitting on each of the turn and river. Op can't beat you except by hitting his draw, and if he does you have no redraws. The pot is 20BB, and you and op both have 15BB left. How big should you aim for the pot to be after the flop betting round?
The answer is 30BB (i.e. you bet 5BB and op calls). Then if the flush does not hit on the turn you go AI for 10BB, and calling is precisely break-even for op. If the flush does hit you fold.
If the pot is smaller than 30BB then op will fold the turn unless his draw hits, so you win less than you would have if the pot was 30BB. If the pot is larger than 30BB then op will call your push on the turn anyway, so you'll just lose more if the draw hits on the turn.
Hence you should aim to ensure that the pot is 30BB after the flop betting round (reciprocally, if op is also aware of the premises then the correct play for him is to raise AI on the flop).
This model is of course, like all models, not very realistic. Before the flop betting round you have no way of knowing that op is on a flush draw (unless there is a mirror behind him or something). But I still think that there is something to be learned from it: if your opponent is on a draw, your stack is small in relation to the pot and if you are able to fold your hand if the draw hits on the turn then it is +EV to ensure that you can give your op bad pot odds on the turn rather than simply to push the flop and "get your money in while you're ahead".
E.g. suppose you have a strong hand on the flop on a draw heavy board with enough opponents that you can safely assume that some of them have draws. Then you could be better off making a small bet on the flop (which can get called not only by strong draws but also by people who are drawing near dead to you or the strong draws) and then dropping the proverbial hammer on a safe turn, instead of just pushing the flop.
I'm a fairly new player, and would be very interested to know if experienced players think that my reasoning here has some merit.
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