Opp is a pretty in control regular. He has been close to making a big bluffs, but has never yet put his stack in as a bluff besides 5bet bluffing vs a 4bet. He min opens every button, and only folds to 3bet 58%. I have actually caught him a few times raising the flop in a 3bet pot with air or a fd. I also suspect, though haven't actually seen him show it down, that he is flatting the flop with nut hands. Now given what I've said, do you call here? I don't think any street is debatable but who knows.

Full Tilt Poker Game #19996463736: Table Hound (heads up) - $10/$20 - No Limit Hold'em - 12:56:58 ET - 2010/04/11
Seat 1: Mirttinur ($4,728)
Seat 2: chemztry ($2,477.50)
chemztry posts the small blind of $10
Mirttinur posts the big blind of $20
The button is in seat #2
*** HOLE CARDS ***
Dealt to Mirttinur [Ad Ts]
chemztry raises to $40
Mirttinur raises to $160
chemztry calls $120
*** FLOP *** [4d Kc Qd]
Mirttinur bets $160
chemztry has 15 seconds left to act
chemztry raises to $445
Mirttinur calls $285
*** TURN *** [4d Kc Qd] [6s]
Mirttinur has 15 seconds left to act
Mirttinur checks
chemztry has 15 seconds left to act
chemztry checks
*** RIVER *** [4d Kc Qd 6s] [7c]
Mirttinur checks
chemztry has 15 seconds left to act
chemztry bets $1,872.50, and is all in
Mirttinur has 15 seconds left to act
Mirttinur has requested TIME
Mirttinur