Hand Help

[Guernica4000]

Cross-posted since I realized that this is the proper forum for my questions.

I need a little help with this hand. I am sure I miss played it but I need to know if I am realizing the error because I am being result orientated or if my math, the chip stacks and the timing supports my later analyzes of the hand.

Multi-table tournament with 300 players left the first payout is 100 players away.
Blinds are 100-200
Chip leader (approximated) = 20,000 tournament
Chip leader table Hero with 12,540
Avg. stack tournament= 3,500

Here is the hand:

Villain has 11,800 and is in MP it is folded to him and he bets 400.
Hero is button with A [img]/images/graemlins/diamond.gif[/img] K [img]/images/graemlins/heart.gif[/img] folded to hero, Hero bets 1,000.
Blinds fold Villain calls. It is heads up.

Flop is
T [img]/images/graemlins/diamond.gif[/img] J [img]/images/graemlins/heart.gif[/img] Q [img]/images/graemlins/club.gif[/img]

Villain checks, Hero bets 1,000 villain calls.

Turn is K [img]/images/graemlins/club.gif[/img]

Villain goes all-in hero calls.

River is 7 [img]/images/graemlins/club.gif[/img]

Villain wins hand with A [img]/images/graemlins/club.gif[/img] 8 [img]/images/graemlins/club.gif[/img] Flush

So after losing the tournament I analyzed this hand and I think I should have folded. Here is why:

I was 99.9% sure Villain had the Ace I had been playing with him for about an hour and there was no way in my mind he would bluff or semi-bluff there.

So if I call I win 1/2 the pot or $2,150 3 out of 4 times but if he is on a flush draw and hits I lose 11,800 1 out of 4 times. Now I don't know how to calculate the probability that he is on a flush draw so I need help there.

Second reason to fold is that if I fold I still have 10,000 chips and a chance to win the tournament or at least finish in the money. If I call and win I have 12,700 but if I call and lose I can get crippled needing to get very lucky to come back.

Comments please. Should I have foleded? Why? Why not? Thanks

It's more like 1 out of 5 times for the flush hitting on the river. But I still think this is a call, but it's an interesting hand. I can't fold the nuts.

think you played perfect. i may have even bet a little less on flop for fear of chasing him out. you got all your chips in with the best hand and he was on a draw at the turn. villain felt he had at least 12 outs. perfect play, bad outcome.

Just think you got unlucky. If you fold the nuts here what hand will you play against the big stacks?