AKQ5

Flop is a good check imo. Top pair is a great start but all else we have is one worst possible straight blocker. Want more board/runout interaction or opponent knowledge in this setting.

Turn we pick up nothing and checking back seems fine.

River changes the board significantly. Him checking 3x means we have an advantage to push. We are blocking his slowplays. I'm betting here. Our actions don't support pot size. Checking to showdown is competitive with block. So bet 25. If raised, we are supposed to turn this combo into a 3bet bluff, I think. But I'd just "oops" fold with a smile and move on.

I don’t like checking this flop. SB calling range has almost no 67 in theory while you have a bunch and with combo draws. SB also has almost exclusively DS hands which means you can get value from weaker flush draws.

Bet flop half pot.

Turn we can pot if we didn’t get XR on flop. SB is capped heavy on this board and handcuffed.

River we can pot representing aces, a busted flush draws, or a rivered 5 in both my line above and yours.

You can also bet half pot to get a call from lower overpairs.

So in theory sb should have a very tight range vs co - especially at lower stakes w/ high rake.

Vs a reg or reasonable sb defend range we do want to cbet this flop at a very high frequency given sb's range will interact very little with this flop. We should be attacking this flop even more on the bu given our range now contains more 67/a2 and even a bit of 62.

That being said if you perceive this player as a loose passive fish their range will hit this board far more often and Id probably just check myself and give up. We have poor removal, will struggle to barrel turns imo and our strategy vs loose passive fish isn't to run huge bluffs but to rather take small stabs and bet large when we have it.

Turn as played I like check. We don't pick up additional equity and still have A2 in our range protected at a reasonable frequency.

River vs check I'm betting 1/3 for value. Blocking KK/QQ not amazing but this player's range should be pretty honest by now (esp if player type is as described).