Pretty badly played HU hand - river decision

[deadlydaveLDN]

Ok, having trouble copying the HH, but it went like this. $1/$2 Heads Up Villain is 79/79 on the button (although I think this is pretty irrelevant here). Effective stacks are $205 He raise to $6, I make a standard 3-bet to $18 with 64s (if anyone is going to come in and say that is a mistake, please don't it is extremely normal HU against a player opening a high % of buttons) He calls and flop is KsQsTx, I bet $24 into $36 and he calls. Not sure if that was really the right play though? If he raises I pretty much have to get it in with a bare flush draw. And now he's called I hate mos turns. Turn brings 3s completing my flush. Now, I obviously have to put in a decent bet $70ish into $84. And for some reason I check. River brings As, obviously a nightmare river, and I check-tank-fold to his $66 bet. I'm pretty sure that this is a correct fold, but I'm not certain. Just trying to work out what Spades he's betting on the river. Js and Ts obviously, and hands involving Js and Ts are obviously in his pre-flop and flop calling range. Anything lower he's surely checking behind? Are there more bluffs in his range than Spades that beat me? So, I guess what I'm asking is whether the river fold is correct, or was my only msitake in the hand the turn play?

[averick]

Re: Pretty badly played HU hand - river decision I'm not a HU player but I'll give my comments based on the facts you provided to the best of my knowledge. Main mistake was the turn where you should have double barrelled given how low your flush was, and you might consider shoving the river even if another spade falls but that would depend on your opponent's characteristics already. Now you only beat 2s and 5s but the way you played it it seems as though you are scared of the flush, and checking the turn and river might very well induce a bluff from him. I agree he's checking behind low spades(8/9 and lower?) so you're either beaten or you've put yourself in a position to be bluffed off the hand because of the weakness you've shown. Don't really know whether the river fold is correct though, I suck at ranging and determining equity so I'll leave that to the rest.