This was a bit of a tricky one...
this is vs what seems to be a reg looking player, anon again.
I think things seems to be ok until the river... but my question is... is this ever a call?

Does a decent ace ever want to check the turn? And then why so big on the river when my hand strength is usually not going to be strong at all here? Seems like if he has a good ace then this bet size just folds out too much to get value from.

Player 1(SB) $12.47 - VP:57 PFR:57 AF:Inf. W:100|100 STL:100|100 3B:0|0 CB:100| N:2.32 Hands:7
Player 2(BB) $5.10 - VP:42 PFR:5 AF:1.5 W:33|44 STL:19|50 3B:2|50 CB:100|50 N:-5.20 Hands:77
Me(UTG) $10
Player 4(MP) $11.42 - VP:20 PFR:20 AF:1.0 W:0| STL:67|50 3B:17| CB: N:1.42 Hands:15
Player 5(CO) $29.16 - VP:27 PFR:15 AF:7.0 W:22|20 STL:69|80 3B:2| CB:56|100 N:-1.32 Hands:103
Player 6(BTN) $16.05 - VP:27 PFR:16 AF:2.0 W:40|75 STL:53|56 3B:7|67 CB:67|40 N:1.32 Hands:93


Pre Flop: Me(UTG) with [Ks,Qs]
Me(UTG) raises 0.30,
Player 4(MP) folds,
Player 5(CO) folds,
Player 6(BTN) calls 0.30,
Player 1(SB) folds,
Player 2(BB) calls 0.20


Flop: (Kh,Ac,5s)(3 players)
Pot - 0.95
Player 2(BB) checks,
Me(MP) checks,
Player 6(BTN) bets 0.65,
Player 2(BB) folds,
Me(MP) calls 0.65


Turn: 8s (2 players)
Pot - 2.25
Me(EP) checks,
Player 6(BTN) checks


River: 6c (2 players)
Pot - 2.25
Me(EP) checks,
Player 6(BTN) bets 1.70,
Me(EP) ?