HUSNG: Facing large Pf raises from Loose passive player

[ghettointlectual]

I posted this hand because this villain does not raise much he usually just limps in and then he raises to 4bb all of sudden and I have KT, I ended up folding the hand but would any of you have called here or maybe even reraised?

Full Tilt Poker
No Limit Holdem Tournament
Blinds: t15/t30
2 players
Converter

Stack sizes:
SB: t1910
Hero: t1090

Pre-flop: (2 players) Hero is BB with T[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/spade.gif[/img]
<font color="#cc0000">SB raises to t120</font>, Hero folds.
Uncalled bets: t90 returned to SB.

Results:
Final pot: t60

IN this hand my question has to do with math, do I have enough equity given my shortstack to go All in here (this is the same villain who rarely raises), and how would I figure this out?

Full Tilt Poker
No Limit Holdem Tournament
Blinds: t15/t30
2 players
Converter

Stack sizes:
SB: t2540
Hero: t460

Pre-flop: (2 players) Hero is BB with 4[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/spade.gif[/img]
<font color="#cc0000">SB raises to t270</font>, Hero folds.
Uncalled bets: t240 returned to SB.

Results:
Final pot: t60

[ChicagoRy]

Good folds imo if he usually limps.

[Nichomacheo]

Your EV from shoving is:

EV = f*p + (1-f)*(2es - k)

f = % your opponent will fold
p = the pot when you shove
e = your equity vs his calling range
s = the effective stack before posting the bb
k = the effective stack minus the bb

Play with it and gl.

[RyanJM]

First hand I would call or fold, with a lean toward fold based on your assessment of loose/passive. He's either got a pocket pair here or a big ace. Re-raise is asking for trouble.

Second hand I probably fold. It's pretty close, but 15/30 you still have room to play with that stack, and you have no fold equity at all. It'd be fine to shove that, but not fine to call all-in in my opinion. I'm not sure what you mean by equity exactly, but if you're talking about fold equity you can google to find articles on it, but the basic idea centers around pot odds. If you raise to 460 total, he already has 270 in the pot and only has to call 190 more to win a 920 pot. 190/920 = 20%, so he'd have to believe he is worse than 4:1 in order to fold here. In reality, he will never fold here with these stacks and a chance to win it. You're basically hoping to be a 50/50 which you most likely are, but there's a chance you're 20/80 which sucks.

[ghettointlectual]

Thank you for the replies and NIch for the formula, I will be playing with it a lot.