KK oop against unknown

do you figure this is a fold as played - opp is unknown
do I put his range on pp & Ax here?

if I figure opp will bluff when i check, do I only call a shove on the flop, but not the turn? What line will a pp generally take here?

Full Tilt Poker Game #7273791064: Table Sphinx (6 max) - $1/$2 - No Limit Hold'em - 13:34:08 ET - 2008/07/18
Seat 1: dwbh28 ($203)
Seat 2: Woollven ($76.40)
Seat 3: uartsims ($77.80)
Seat 4: Spear1 ($205.70)
Seat 5: ADCampbell ($97.60), is sitting out
Seat 6: baba85 ($200)
baba85 posts the small blind of $1
dwbh28 posts the big blind of $2
The button is in seat #4
*** HOLE CARDS ***
Dealt to dwbh28 [Kc Kd]
Woollven raises to $6
uartsims calls $6
Spear1 folds
baba85 adds $1
baba85 folds
dwbh28 raises to $25
Woollven folds
uartsims calls $19
*** FLOP *** [7c 6c Ad]
dwbh28 has 15 seconds left to act
dwbh28 checks
uartsims checks
*** TURN *** [7c 6c Ad] [9d]
dwbh28 checks
uartsims bets $52.80, and is all in

I think you've got to bet the turn here at least. But probably folding as played.

how much are you betting on the turn knowing he has $52 left which is just under pot

After he checks back flop, check until he bets or you win, then call.