Why go "all-in" In?
When you are between 40 and 60 big blinds you should not be afraid to finish all in with hands like A-K or 10 to 10 before the flop or A-Q and Q-7-3 flop. You should do well control with hands like top pair, weak kicker, but with better hands should be happy to finish all in in a tournament.
If you make a raise pre-flop with AQ, AK, 10-10, JJ, QQ, KK or AA and receive a re-raise in response, you should go all in when you have less than 60 blind unless your opponent is an extremely passive player .
Here's an example: You have a stack of 50 big blinds and raise pre-flop 2.5 big blinds with A-Q. An aggressive player responds with a 3-Bet 7 big blinds on the button. In this situation you should go all in pre-flop.
If you made the preflop raise in top positions, the situation changes slightly as your opponents will mean you're coming up with a strong range of hands. In that case, you should fold the A-Q to a 3-bet, but go all in with A-K, 10-10 J-J, Q-Q, K-K or A-A.
Against the most aggressive players you must be willing to gamble pre-flop with a wider range of hands. Suppose you have an aggressive style of play, a stack of 40 BB and raise pre-flop 2.5 blind in middle position against tight players in the blinds. A rival tight (solid). "> Loose aggressive (LAG) who knows your game reraises to 7 blind in the cutoff.
In that case you can gamble pre-flop with a variety of hands as likely that you achieve the fold of your opponents. To do this you must know their tendencies and playing styles.