Many novice PLO players struggle with properly constructing their 3betting range. ITT I will outline the factors and considerations you should be taking into account when whether or not to 3bet.
Unless otherwise specified, lets consider effective stack 100BB's
Isolation: I believe this is one of the most important yet somehow overlooked or underestimated factors, so I'm leading with it. HU,(IP), with initative is one of the best positions you can put yourself in. Weak opponents should be ISOd relentlessly. Actively search for these spots. Get out of your comfort zone and ISO that wide MP open with JT76DS or A456 nut suit. These hands play so much better HU than multiway.
When isolation is unlikely or impossible, we should only 3bet in rare cases of extreme value. Here is a HH example to illustrate this point:
Poker Stars $200.00 Pot Limit Omaha Hi - 6 players
The Official
2+2 Hand Converter
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BB: $267.95
UTG: $203.40
MP: $272.20
CO: $58.00
BTN: $47.20
Hero (SB): $258.90
CO posts a big blind ($2.00)
Pre Flop: ($5.00) Hero is SB with 2
A
K
K
1 fold,
MP raises to $9, CO calls $7,
1 fold, Hero
Pretty nice hand. Certainly better than MP open and CO call range, so 3bet right? No. There is no isolation possible, and 3betting would just have us go to the flop 3ways OOP, and a hand that has low playability. Take the same hand and I'm in the CO against a MP open and I'm fist pump iso 3betting all day.
Balance/deception: We are going to cbet most of the time as the PF 3better, we are going to get called or raised sometime also, so we need to have a well diversified range that connects with alot of boards. For this reason, hands like 4 middle cards are great to 3bet, because they connect with alot of boards and protect the high card portion of our 3betting range. Take it from me: Most villans at SSPLO react in a very -EV way when a PF 3better cbets and or barrels a board that doesn't fit what they think a 3b range should be. This becomes especially apparent/valuable as stacks become deeper. I can't tell you how many times I've flopped the joint on a 458 or 679 board and seen villans spaz out way too deep with varying amounts of horrible equity.
Value: IMO this is actually the most overrated, and misunderstood factors, but it still matters. Is my hands better than my opponets? This is more important when stacks are shallow and less important as stacks are deeper.
Here is a guide on what a 3betting range might look like for a good, aggro, positionally aware player. These ranges aren't perfect, and it is difficult to create and format them in a way that is easy to read, but I'm giving it my best shot.
Let's assume all Villans are TAG and effective stacks are 100BB's.
Note: These ranges are all for HU pots, any limpers or callers between and your range should tighten dramatically and be aimed at more playability/value hands.
Cheat Sheet:
CO or BTN against a UTG or MP open: All AA, decent KK, very good DS QQ and JJ, AK(QJT or 9) ss+, AQ(JT9)ss+, AJ(T98)ds, KQ(JT9)ss+, KJ(T98)DS, QJT9ss+, JT98ss+, JT8(76)ds, T987-8765ss+, T986-8764ds, very good 2 prs< JJ
BTN against a CO open: See above Add in Mediocre KK-JJ, Very good TT-66, AK(any 2 within 2 ranks)ss+, AQ(within 2)DS, AJ(98)(87)(76)DS, AT(2 within 3)DS, A987-A456ss+ KQ(J8)(T8),(87)ss+KJT(987)ss+,QT(98)(97)(87)ss+,QT (97)(96)(86)ds, JT76DS, J98(76)ss, J97(65)DS, T876- 8654ss+, all DS or connected 2 prs.
SB or BB facing an UTG or MP open: Good AA, very good KK-QQ, Premium broadway hands, and super premium rundowns.
SB or BB facing a CO or BTN open: All AA, decent KK, very good DS QQ and JJ, AK(QJT or 9) ss+, AQ(JT9)ss+, AJ(T98)ds, KQ(JT9)ss+, KJ(T98)DS, QJT9ss+, JT98ss+, JT8(76)ds, T987-8765ss+, T986-8764ds, very good 2 prs< JJ
Remember, there is much more to consider than the absolute value of your hand.