AK semibluff vs both

not really a semibluff, you can't expect them to fold better hands too often

I would check but it's not a big mistake to bet as you won't face a checkraise and you have outs and maybe small foldequity against 33 A2 or something but most of the times you'll get called by some pair and on a blank River, you have no foldequity and you are supposed to check back. The question is whether to fold on a donkbet by Mp1 or BB. Problem is: Mp1 could bluff the River with hands like 89 or 87 so it's kind of ugly to check back and fold the River ui. YOu have showdownvalue and so actually i'd like to invest 1BB anyway so why not betting the turn then? Your position is an advantage in case if you check back the turn, bb bets and Mp1 calls. you can be certain to be behind but if just 1 bets, it could be still some drawing hand and i don't like folding. So bet Turn - as you invest 1BB anyway - is fine