UTG: €39.51 (VPIP: 37.59, PFR: 29.79, 3Bet Preflop: 2.08, Hands: 144)

MP: €134.72 (VPIP: 55.99, PFR: 20.03, 3Bet Preflop: 5.32, Hands: 595)

CO: €54.79 (VPIP: 32.44, PFR: 21.31, 3Bet Preflop: 7.55, Hands: 949)

Hero (BTN): €50.00

SB: €86.51 (VPIP: 31.84, PFR: 24.08, 3Bet Preflop: 6.37, Hands: 4,338)

BB: €81.06 (VPIP: 53.27, PFR: 22.43, 3Bet Preflop: 6.80, Hands: 216)

6 players post ante of €0.10, SB posts SB €0.25, BB posts BB €0.50

Pre Flop: (pot: €1.35) Hero has 3s Ts Kd Qs

fold, fold, fold, Hero raises to €1.25, fold, BB raises to €4.00, Hero calls €2.75

BB is a new player on this site.  His stats are kinda crazy but it might be a sample size issue, I don't know.

Flop : (€8.85, 2 players) 8s Tc Ks

BB checks, Hero bets €6.19, BB calls €6.19

I flopped really well, so easy value bet.  His x/c seems a bit weird though.  First off, if he had AA+ss I expect him to x/jam or bet/call, instead of taking this passive line (also I block 3 spades).  I think he would play hands like KQJ9 or JT97 similarly at this SPR.  Maybe he has hands like AKJ5 or naked AA that is being suspicious (somewhat unlikely though)?  I couldn't think of many hands that he would x/c.

Turn : (€21.23, 2 players) 8c

BB checks, Hero checks

Not a great card, but in retrospect I probably should have barreled to get value from draws and AK, etc.  In game, I thought there are few bad cards for me on the river, but that doesn't mean I should check this back..  

Thoughts?

River : (€21.23, 2 players) 8d

BB checks, Hero ??

Well, if he happens to have AA, he's not folding now.  AK might not fold either, since it's a very good bluff catcher in this spot, although I can't be too sure.  I still beat hands like bare AQJ5, AJT7 etc. and might be able to fold those out, but tbh I was kinda lost in this spot.

Check back and mostly give up, or fire another barrel?