Exploiting ranges

Meet Dave. His preflop 3betting range from the button in response to a CO raise is 99+,A9s+,KJs+,QJs,A9o+,KJo+,QJo

but

his stackoff range to a 4bet is just JJ-AA,AK..

How do we work out how to exploit this information?

Will the same theory apply in this situation as would apply in a postflop situation?

Obv this situation is a little wooden and not especially realistic considering game flow/dynamic and how he views you isn't taken into account. However using your guidelines your best course of action is to 4 bet every time he 3 bets your co raise untill he adjusts.

And no, the same theory wouldn't apply to postflop.

Originally Posted by ATOTHEC101

Obv this situation is a little wooden and not especially realistic considering game flow/dynamic and how he views you isn't taken into account. However using your guidelines your best course of action is to 4 bet every time he 3 bets your co raise untill he adjusts.

And no, the same theory wouldn't apply to postflop.

What I was getting at was the actual theory behind 3bet and 4bet ranges and exploitation and that...

Well 4betting everytime wud be bad, call with our monsters.

Assuming no adjustments are made fourbet the worst hands in your range. Flat anything that you want to play.

Little math behind that... The 3betting range you gave is ~12.4% of hands. The stack-off range is 3% of hands. So when faced with a 4bet, we can expect villain to call 3/12.4 or 24% of the time. Meaning he folds 76% of the time.

Assuming the action goes, we open 3x, he 3bets to 9x, and we 4bet to 24x, then we will be risking 21BB to win the 34.5BB pot (our 21 + our 3 + his 9 + 1.5 blinds). This raise has to work only 61% of the time to be profitable. And since we know without adjustments he is folding to 4bets 76% of the time, it will be profitable to 4bet bluff him, and often (until he adjusts).

So, as others said, 4bet the worst hands in your opening range, as they will be +EV based on fold equity alone in this spot, and flat his 3bet with the range you wish to continue with.