Sunday Warmup: TPTK Gets Check-Raised On Turn

[JSH06]

PokerStars No-Limit Hold'em Tourney, Big Blind is t50 (8 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

SB (t13000)
BB (t17200)
UTG (t9850)
UTG+1 (t8625)
MP1 (t10775)
MP2 (t9850)
CO (t9725)
Hero (t10975)

Preflop: Hero is Button with K[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">2 folds</font>, MP1 calls t50, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to t200</font>, <font color="#666666">2 folds</font>, MP1 calls t150.

Flop: (t475) 4[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
MP1 checks, <font color="#CC3333">Hero bets t250</font>, MP1 calls t250.

Turn: (t975) 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
MP1 checks, <font color="#CC3333">Hero bets t675</font>, <font color="#CC3333">MP1 raises to t1950</font>, Hero?

Ok, it looks like a standard laydown too me. Check-call flop followed by check-raise turn is usually sign of a big hand. However, the players in these Sunday MTTs are pretty awful. I'm going through a big downswing so maybe I'm just second guessing myself.