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...(I)f I become convinced that someone is drawing to a flush, I will move in no matter how ridiculous an overbet this is. You will surprised how often they call anyway with just the flush draw no matter how terrible the odds they are getting. Most people at the low limits will call ANY bet with a flush draw.
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I agree totally, but it's very game dependent. The idea is that you want to bet the maximum you think will get called, but in no case do you want to bet so little that the flush draw is getting correct implied odds (which includes the possibility that you'll pay off once the flush is made). The order of preference is:
<ul type="square">[*]Make a huge bet (e.g. all-in) and get called.[*] Make a substantial bet (e.g. 3/4 pot, but certainly enough to limit implied odds) and get called.[*] Make a substantial bet and get the draw to fold correctly.[*] (Worst option) Make an insubstantial bet and give the draw a cheap card to beat you.[/list]
For example, in Pacific 12c-25c I would agree that pushing is likely to succeed hence the most +EV; at Absolute 10c-25c the players are usually too sophisticated to call that, but often will call a pot-sized bet without the implied odds to do so.