From a 1 x 8, Point-to-Point Diamonds, or any other applicable
  formation in which there are Centers of each side.
The Centers of each side work together, around the Very Center
  dancers, to do the first anything call (ending, if possible, near the short
  axis of the starting formation; 
  see note below);
  Remaining Outsides (2 or 4 dancers) move toward the Center (without changing
  their facing direction) and work with the original Centermost dancers to do the
  second anything call.
- Within the following possible starting formations for Checkpoint,
 
- The  dancers take the first anything call, and dancers take the first anything call, and
- The  dancers take the second anything call. dancers take the second anything call.
Note: If the first anything call ends in a 2 x 2,
  the dancers doing that call must end close to the short axis of the starting formation.
  The following diagrams indicate the ending formation after the first
  anything call when the first anything call ends in a 2 x 2.
Hint: Those doing the second anything call should wait until those
  doing the first anything call have moved out of the way.
| Checkpoint Touch 1/4 By Flip The Diamond: 
 | 
| Checkpoint Recycle By Turn & Deal: 
 | 
| Checkpoint Single Wheel By Grand 1/4 Thru: 
 | 
| Checkpoint Trail Off By Dixie Style To A Wave: 
 | 
| Checkpoint Walk & Dodge By Explode The Wave: 
 | 
Reverse Checkpoint anything By anything [C3B] (Vic Ceder 1985):
 From applicable formations.
  Center 4 do the first anything call and the resulting Ends (of that
  Center 4) move away from the Center of the Set without changing their facing
  direction (i.e., Stable).  The Others (original Outsides) work around
  the Very Centers to do the second anything call, ending as close as
  possible to the positions vacated by the resulting Ends of the Center 4.
 See also Prefer CONCEPT 
for a variation of Checkpoint.