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3-betting and fold equity in FR NLHE
My first effort at a decent FR strat post, spoons coaching has done me good.
So lets say in LP/MP we have a villain who opens the betting with a range:
22+,ATs+,KTs+,QTs+,JTs,ATo+,KTo+,QTo+,JTo (for those of you who like graphical representations I included pokerstove below, hands included in the range are yellow)

What range of hands does the typical tag continue with here?
Probably something along the lines of JJ+,AKs,AKo

Lets look at the total combinations in his opening range:
Each pair has 6 combination: 13x6
Each suited hand has 4 combinations: 10x4
Each offsuit hand has 12 combinations: 10x12
=238 combinations
Now lets look at the total combinations of his continuing range to 3bet:
Pairs: 4x6
Offsuit: 1x12
Suited 1x4
=40 combinations
So (238-40/238)*100= 83.2%
We have A LOT of fold equity as he is folding 83.2% of his range to our 3bets
Lets look at the maths behind the actual 3bet and how often he needs to fold to make it a break even play preflop. He raises 4bbs, we reraise to 12bbs total it folds round to him, so we have 1.5bb in dead money
12/(4+12+1.5) as a percentage = 68.5%
We risk 12 to win 5.5, to make this a breakeven play we only need villain to be folding 68.5% and given the range above we know that he is folding 83.2% if his oopening range is anywhere near correct for MP/LP raise.
Ok, so what range should we be 3betting with?
Obviously we can 3bet with our value range, which as default should be QQ+, AKo, AKs - but obviously we can 3bet a lot wider range as he folds too much and we can exploit this. Good hands to 3bet with are ones which contain blockers, such as any A, K, Q, making it less likely he has a big pocket pair as it leaves les combinations in the deck. If we do get called preflop, we also want to chose hands that have added equity/hidden value postflop, such as connectors and suited hands.
Something llike this might be a good place to start:
QQ+,AKs,A9s-A2s,KTs-K6s,QTs-Q8s,J7s+,AKo,A9o-A2o

You can add/remove hands as you see fit
OK, so lets break down our range into a value range A and a bluffing range B
Our A range includes
3pairs, 1suited hand and 1 offsuit hand = 34combinations
Our B range includes
8offsuit hands and 20suited hands = 176 combinations
A+B= 210
%bluff range= (176/210)*100= 83%
Now lets say villain is good and adjusts to 4bet bluffing us, lets do the math too see how often we need fold to make it profitable for him. He opens 4bb, we 3bet 12bb he 4bets 32bb
So he's betting 28, (that's 32 minus original raise of 4) to win our 17.5.
28/(28+17.5) = 61.5%
If he makes this adjustment he's going to be owning us, as we are bluffing 83% of the time when we 3bet. All we'll need to do is then reduce our 3bet bluffing range below 61.5% and we are unexploitable against 4bet bluffs
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