AK off OOP

[TheFoxNL]

villian just moved here and i moved here 3 orbits ago so i dont have much on the OR either
his flat call seemed strange and tricky to me

PokerStars No-Limit Hold'em Tourney, Big Blind is t100 (9 handed) internettexasholdem.com

MP3 (t1430)
CO (t1175)
Button (t4790)
Hero (t6645)
BB (t10320)
UTG (t1635)
UTG+1 (t630)
MP1 (t4635)
MP2 (t2875)

Preflop: Hero is SB with A[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/heart.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">MP1 raises to t300</font>, <font color="#666666">4 folds</font>, <font color="#CC3333">Hero raises to t900</font>, BB calls t800, MP1 folds.

Flop: (t2100) 6[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/heart.gif[/img], 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, BB checks.

Turn: (t2100) 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">BB bets t1000</font>, Hero ???