How should hero play this river with 8 high after barrelling from the flop?

I'm fine with the turn bet as I would expect him to have a reasonably wide range OTT and now we have the OESD. Once he calls the turn I think the bottom of his range is Qx - if we bet the river let's say he folds all Qx/calls with all Ax. I would think if we bet say 14bb it's profitable but its close - now we also don't know if he folds Qx OTT or if he'll call Qx on the river. This could turn it into a check - would use population info to make that decision

Bet turn bigger ,

Got to bet now , he can have K10dd J10dd 6xdd

66% pot or so looks fine so you can still have AK

I think I would exploit flop by betting like 1.25-1.75 bb which allows for smaller turn sizing.

Hmm I like the turn sizing. You can go closer to pot, 1/2 is fine too or 1/3. Sometimes I like going smaller also so you can size up river for a smaller amount.

Hmm river is a decision. You think he going to fold correct? I might check back river bc I feel calling 6 on turn- villian kinda gotta expect you to go for river also. Hmm mix prolly check crying when he has 2nd pair. I would prolly x bc maybe some weak Ax is calling pre and not raising

Yes I agree the bottom of his range is Qx once he calls the turn, and some 6x that picked up a flush draw. Definitely if he folds the Qx and some Ax to a large river bet, it's the way to go. I have a large randge advantage on this board, and all draws have missed. It should definitely be go time on this river.

Yes I agree that I could have gone a little bigger on this turn.

My concern on the river was that his range contains a lot of Ax that probably isn't going to fold.

Yep. If you bet 9bb into 9.5 on the turn you can shove 27bb effective into 27.5 on the river.

Yeah - I agree that this is probably a mandatory triple barrel. No showdown, no diamonds, polarized range. I believe it's a great combo in theory. However, there were other factors at play here. It was late on day 1, we had made the money and I had built up my chips to 20x starting stack. I really wanted to run deep in this tourney, and didn't want to bluff off a boatload of chips. I was also concerned that my opponent would have a lot of Ax, that is unlikely to fold. So, despite knowing I was meant to bluff it off here, I checked it back. To my dismay, villain showed J♦6♦, and I suspect would have folded to a large bet. I think there is a natural inclination to be risk-averse in these spots, and to put villain in the stronger part of their range (that isn't going to fold to a bet), when in reality of course they have their full range of hands, and the bottom of that range is going to fold most of the time. He has the wrong bluff-catcher here (with diamonds) and the board is great for my range. I've repped it all the way, and this is a spot where I should rep it on the river too. A clear miss - although I did run deep and get a nice cash.

The ICM angle makes sense emotionally but you're shoving about 27bb into a 27bb pot, so missing the bluff doesn't actually cripple you at 80bbs. The stronger argument for checking is villain's range: calling two streets on AQ67 with no flush draw skews real heavy toward Ax and some 6x, so your actual fold equity is probably worse than the theoretical model assumes. I've fired similar spots in €200-300 live events and gotten snapped by A9o that floated the whole way, so the instinct to protect your stack isn't crazy, just make sure you're reading his range and not just your chip count.

Yes, that was pretty much my thinking too. Nb there was a flush draw on the turn.