Is this a spot to check raise? I don't ever do it so not really sure what to do with it. Think probably my 4 is not an out in a lot of cases as he can have a lot of Ax. Means OESD less likely to land as well.

PP and OESD on low board though felt like good spot to semi bluff check raise.

PokerStars - $0.10 NL (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4

Hero (BB): $10.00
UTG: $10.09 (VPIP: 18.18, PFR: 9.09, 3Bet Preflop: 0.00, Hands: 11)
MP: $11.29 (VPIP: 16.36, PFR: 11.82, 3Bet Preflop: 0.00, Hands: 111)
CO: $17.89 (VPIP: 34.78, PFR: 15.22, 3Bet Preflop: 0.00, Hands: 47)
BTN: $10.93 (VPIP: 59.26, PFR: 25.93, 3Bet Preflop: 0.00, Hands: 28)
SB: $8.45 (VPIP: 7.41, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 28)

SB posts SB $0.05, Hero posts BB $0.10

Pre Flop: (pot: $0.15) Hero has 4 4

fold, fold, CO raises to $0.30, BTN calls $0.30, fold, Hero calls $0.20

Flop: ($0.95, 3 players) 5 2 3
Hero checks, CO bets $0.52, fold, Hero raises to $1.50

It's probably okay in principle (possibly we're bluffing too often if we do this - overs + backdoors is probably better because it allows better barrelling opportunities but I'm not concerned about turning SDV into a bluff here considering it's often going to be really tough to get to SD) but I don't really like it against this player. X/c is better.

Thanks TDA. Would you call another street if unimproved? K, Q or J if they bet for example?

Against a DB, assume a 6 out draw with little in the way of implied odds and check the pot odds.

So no unless he bets pretty small then?

Yeah, basically.