OK lets make it simple:
Party Poker No-Limit Hold'em Tourney, Big Blind is t100 (6 handed)
converter
CO (t1230)
Button (t530)
SB (t2305)
BB (t860)
UTG (t1820)
Hero (t1255)
Preflop: Hero is MP with A[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/club.gif[/img].
<font color="#CC3333">UTG raises to t200</font>, Hero raises all-in [t1255]
Is that correct? If yes: WHY? If not: WHY NOT?