PokerStars - $0.05 PL Hi FAST (6 max) - Omaha Hi - 6 players
Hand converted by PokerTracker 4

BTN: 52.4 BB
SB: 50.2 BB
BB: 101.4 BB
UTG: 136.2 BB
Hero (MP): 114.8 BB
CO: 443.8 BB

SB posts SB 0.4 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.4 BB) Hero has A T K 5

fold, Hero raises to 3 BB, fold, fold, fold, BB calls 2 BB

Flop: (6.4 BB, 2 players) A 9 2
BB checks, Hero checks

Turn: (6.4 BB, 2 players) 4
BB checks, Hero checks

River: (6.4 BB, 2 players) 4
BB bets 6 BB, Hero calls 6 BB

BB shows A Q Q 3 (Two Pair, Aces and Fours)
(Pre 54%, Flop 17%, Turn 13%)
Hero shows A T K 5 (Two Pair, Aces and Fours)
(Pre 46%, Flop 83%, Turn 88%)
Hero wins 17.6 BB

So, I am wondering if this is the type of situation where we check back the flop.

Pre: fairly standard AK[Q-T][2-5] single suited to the ace opens MP.

Flop: I have some backdoor equity apart from the NFD (but I block the K), some of my two pairs will be tainted by the diamond flush. I think I want to keep my opponent range wide as well as mine. This is definetely the street I am more unsure about: if as it goes I check back twice I really have gotten a free pass to the river to my opponent. On the other hand, if I get called and the board doesn't come with a club I am not too happy to keep on betting.

Turn: A low card that completes the flush, but no sign of interest from my opponent, but my ace high hand has gotten weaker, I am not folding better two pair or better without betting twice and some of the times my opponent will have a weak FD. Had I had a diamond in my end I could have tried to bet here?

River: A second four comes, my opponent bets and I call figuring that my range must appear very weak to him having checked twice IP, so I shouldn't really fold my ace for one bet. I guess here he's turning any weak hand (like a pocket pair or a weak ace) into a bluff and betting any hand that completly missed as well as weak FD and rivered fours (though he called a raised from OOP and I have the 5 slightly blocking some combo with fours so I am not super concerned.)

I am also a plo noob. I think betting and checking flop is fine. It would be a bit annoying to face a raise with no flush draw, but on the other hand bb shouldn't have a big raising frequency here. I would fold river because I am a nit. No diamonds no good.

While xback flop is strictly speaking, not terrible with your hand, high frequency cbet on this texture tends to be even better because of the ax and its not wet enough for villain to xr wide.

Normally betting half pot as default and can call xr.

I follow the first part, cbet and barrel many turn (i guess any improvement and most non diamond).

But if you say opponent is not xr lightly here, how do I call a check raise here?

I think an issue with checking the flop is it invites your opponent to bluff you off your equity on a wide range of turn cards. If you don’t hit a non-diamond two pair out, you’ll have a hard time calling any sizeable bet on the turn.

This answer gets very complicated quickly depending on the assumptions we use but to keep it simple:

TPTK with backdoor nut flush draw, and many backdoor straights is a very good hand, and folding it quickly vs bluffs/semi-bluffs is a big mistake. We also have decent equity vs many 2p. Hero also benefits from range advantage and the fact that villain should almost never have top set.

Flop is sort of whatever. I would lean towards betting.

River you probably want a diamond to think about calling. Also all the draws hit it's really hard to find natural bluffs from your opponent's range.