What do you do when you have a crap hand when you're the SB? In any other position, it's an easy fold. In BB, check/fold. But SB. Waht do you do? Do you limp and try to see the flop at a discount? Or do you just throw it away, not wanting to waste your time? Usually tossing them away is the right decision, but sometimes you end up throwing away a monster.

Waht do you consider? Number of limpers before you? Your read of the BB? Your own chip stack? Are there any hard and fast rules?