Re: Never coldcall rule (theorish)
You just have to be able to discriminate. For instance, say there is a player who likes to steal in CO/button preflop by raising to 2.5xBB. He does it so much and is still sufficiently deep that you know he will fold to your 3-bet. Great - so you open your 3-betting range, blah blah. Now, say that you have KK in the BB at ~20xBB. You also feel that he's itching to make some sort of post flop play and that you've been reasonably active on flops (as I suspect you would). I think it's a sin to 3-bet here.
Barry
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