Due to the fact that most people u play HU in mtts/sngs will not be HU specialists, we can approach these with a really overly simple style and remain profitable. Vs players with limited HU experience, I will min virtually every button and c/b 60% on most flops. Obv if villain starts playing back REGULARLY then we can change our strat and start opening a tighter range, but people tend to find it hard to open their 3b range with <50x stacks as it makes flop and turn sizing difficult. We also play v tight from the BB. I always have donk-bet and f/donkbet in my HUD. IMO, f/donk is one of the most profitable stats you can have for playing oop, esp in these HU situations.
As for the hand in question...I think checking back our A6s is fine. It allows us deception on "A" high flops, and we can win at showdown a reasonable amount vs btn"s limping range.
I dnt like ur flop sizing. Villain rarely full-pots it with no pair. If we were IP then we can size it a little smaller, and c/ back turn, but oop, our priorities are different. We don"t want to leave flatting as an option for villain, as it means we face being oop on turns, which is going to be tough on blanks. I think making it ~2250 is better. This should force villain to fold his weak pairs, but also leaves enough fold equity for him to shove his inferior draws. In general, it is a bet size that very little of villains range should ever be flatting.
Obv our stack size is pretty awkward for turns (maybe another argument for maximising f/e ott). I would like ur small bet to set up river shove a lot more if I was IP, but oop, we don"t really want to be giving villain option to continue. I prob jam all blank turns and bet small to induce from worse made hands/pair+draws when we get there. Obv this is exploitable vs gd knowing villains, but u wnt need to worry about it here (nothing against villain, just neither will have any understanding of the others HU game without a large sample size).
As played, river is pretty tough. I dnt tend to double barrell and then give up on rivers, and am usually a big advocate of triple barrelling. I think if people decreased their bluffing freq, but turned their double barrells into triple barrells, they would be way more profitable long-term. This is such a grim river tho. When we bet so small on the turn, we do keep his worse draws in the hand, but I think these are more likely to bet/3b flop. Think I c/f and mark the note to review, then shout at myself. Prob jam all overs, but I think his range is weighted to weak J"s and I cannot see him folding these on blank undercards.