Here are some tips:
** Play mainly shove-fold at 12bb effective stack or less
** Deeper than 12bb effective, min-raise the button and limp the small blind
** Defend wide in the big blind facing min-raises
** Learn something about your opponents as quickly as possible
On the last point, tagging them as "Probable maniac" or "Seems tight" gives you some info to go on when it's close. Even one hand can give you a good indication sometimes -- for example, a player who raises 63s on the button is likely super-loose.
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