KA pre-flop, 90 people left, currently 44th

Below is a hand from a £2 game on betfair poker (400 people in total). I was around 44th in the tournament at the time, had no real reads as I was relatively new to the table. Had 5500 chips, tournament leader has roughly 18000 last time I checked. Only one guy who has me covered after me. If you need any more information

------HAND 5------
Game #859195153: Texas Hold'em No Limit (150/300) - 2005/08/15 - 21:14:39 (GMT)
Table "Tourney 941342 - 6" Seat 4 is the button.
Seat 1: slacker (5715 in chips)
Seat 2: Seppl79 (7610 in chips)
Seat 3: minime55 (2207.50 in chips)
Seat 4: champions (10475 in chips)
Seat 5: lindy11 (4570 in chips)
Seat 6: VVuZZ (8040 in chips)
Seat 7: J.M.H (16880 in chips)
Seat 8: Pac_man (2185 in chips)
Seat 9: AnnePoker (2400 in chips)
lindy11: posts small blind 150
VVuZZ: posts big blind 300
----- HOLE CARDS -----
dealt to slacker [Ks Ah]
J.M.H: folds
Pac_man: folds
AnnePoker: folds
slacker: raises to 2000
Seppl79: raises to 7610 and is all-in
minime55: folds
champions: folds
lindy11: folds
VVuZZ: folds

What now? Should I fold after his all-in? Or am I already committed? With that in mind should I have pushed first or simply called?

cheers

[illegit]

You raised nearly >1/3rd your stack with a premium hand. Now it costs you the rest to call getting @ 2.2-1 on your call with what could be a dominating favorite or a coinflip. Easy call.

Your open-raise was too big though. Open for 1000 and then if this happens you can actually make a decision on whether or not you want to race, but how you played it I think you have to call.

[betgo]

It doesn't have to be AK, you are pot committed and need to call a reraise with any hand you raised with.

With 19xBB, you don't want to fold AK preflop period against one opponent.

The huge open raise is not good style, but it succeeded in getting action here. Open pushing for 19xBB is also bad style, but it is playable here because you have such a strong hand and a lot of your opponents have a lot less than 19xBB.

The normal play is to open raise 2.5-4.5xBB. If a raise is likely, I would probably play for a limpraise here, since you have the right size stack to make a reraise allin.