As a prelude to this post, for the sake of fully explaining myself, I am going go into more detail than needed, but I will bold objects that are most important to the topic at hand.
When using a tank drive (equivalent to a track drive for this purpose), there are a few options of movement. You can move Left Drive(L) Forwards (F) or Backwards (B) as well as not moving (N). This also applies to the Right Drive(R). This means that you can have these senarios:

LF RF =forwards
LF RN =curve clockwise to the right with your R as the pivot point
LF RB =turn clockwise with a point between the drives as the pivot point

LN RF =curve counter-clockwise to the left with your L as the pivot point
LN RN =stopped
LN RB =curve clockwise to the right with your L as the pivot point

LB RF =turn counter-clockwise with a point between the drives as the pivot point
LB RN =curve counter-clockwise to the right with your R as the pivot point
LB RB =backwards

This is the list of basic movements for a tank-drive robot non-inclusive of speeds (varying PWM values or gear ratios) and also non-inclusive of choosing between sharp braking or glide-braking with your victor's.
The four options bolded above allow the robot to move away from a wall that one side parallel to it's drivetrain direction is pressed flat up against. This is because the robot drags around the turn and thus means that your pivot point becomes the upper or lower point of contact with the side of the field instead. That is the theoretical easiest way out. In reality, all FIRST robots motors (drill, CIM, fisher-price, van-door, window, etc...) are powerful enough to push the robot out in any of the turning configurations barring another robot pinning you there.
I hope this answers your question for you, but I've been doing History for an hour (Civil War), so I may be making a few mistakes. Correct at will.