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I'm not sure why you're putting emphasis on "narrowing someones range" being a good thing. If we raise here, we're doing it for value, not because we want to narrow his range. Preferably, he is a total station and calls our 3 bet with his entire range so we can get post flop with trash like K6 and Q8 that we completely dominate. You don't ever want villain to fold a worse hand just so you can have a more accurate idea of what he might have. You never want villain to fold a worse hand or range when you bet or raise for value.
So what this question comes down to is your opponent and his tendencies. If he folds to a lot of 3 bets and opens really wide b vs b then calling has it's merits.
1. We leave weak hands in his range that can call 3 streets with top pair below our KK that he will fold preflop to a 3-bet.
2. If he steals a lot b vs b like you expect, by calling with a hand as strong as KK, we can balance our range and allow us to defend more profitably in position with weaker holdings. If we're flatting a lot of hands b vs b and suddenly 3-bet here, it's likely our 3-bet will get less value than it would in a vaccum vs this guy.
*The opposite is true if we have been 3-bet bluffing a fair amount to his sb steals. We are in this case olbliged to 3-bet KK as we can expect more action from his marginal hands that we crush and build the pot as quickly as possible in the process.
Ok so when is it better to 3-bet?
1. When we've been 3-betting already b vs b like I've already said.
2. If villain is likely to 4-bet light, or is just loose preflop and will call with stuff like KJ, 88, T9s etc.
So to answer your question as best I can, It all comes down to your opponent, you dynamic and history with him, and his tendencies.
To generalise, vs and unknown with no history, 3-betting is generally my play because at these stakes people tend to limp the sb an awful lot so raising usually indicates some sort of vague strength. What I mean is people in general don't like to fold to 3-bets when they have half a hand too much so we can expect to be called fairly often.
So think about your opponent and his stats if applicable an make your decision based on the facotrs I've mentioned and how +EV you think each play will be. Don't do anything because you want to "narrow his range." Get value, maximise EV and exploit bad players. That's what the micros are all about so stop worrying about stupid arbitrary concepts like "narrowing someones range so you don't get stacked on Q72 when he has 72." If he opens 7,2 b vs b he probably bluffs at flops (giving you monies) and pays off too many value bets and raises by you on 743r or JJ2 or whatever (again giving you monies.)
The wider he opens, the more hands you can call or 3-bet with. The more hands he calls 3-bets with the more hands you can 3-bet for value. The more hands he folds to 3-bets, the more you can flat call with your value range (hands that are ahead of his range) and 3-bet as a bluff with bad/less playable hands.
To put it simply, someone who opens shit like 72o b vs b is so so easy to destory in position all day long. Be happy about it and think about the EV of each option you have and maximise to hell.
Hope this helps.
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