From a 2 x 4 (or other applicable formations) with precisely two Leaders
  in each Line.
In the following diagrams, designates the Leaders in each Line as
designates the Leaders in each Line as designates the other dancers.  
  The dancers designated by
designates the other dancers.  
  The dancers designated by can be
  facing in any direction other than the same direction as the
can be
  facing in any direction other than the same direction as the dancers in their 1 x 4.
dancers in their 1 x 4.
| |   |  |   |  |   |  |   |  | Leaders in a R-H Wave setup...
 |  | a L-H Wave setup... |  | a R-H 2FL setup... |  | a L-H 2FL setup. | 
 | 
  - Checker Board anything:
- The Leaders in each Line ( dancers) Trade with each other 
      as the others do the anything call working in a distorted 1 x 4.
      Ends in a 2 x 4. dancers) Trade with each other 
      as the others do the anything call working in a distorted 1 x 4.
      Ends in a 2 x 4.
  
- Checker Box anything:
- The Leaders in each Line ( dancers) Trade with each other 
      as the others do the anything call working in a distorted 2 x 2. 
      Ends in a 2 x 4. dancers) Trade with each other 
      as the others do the anything call working in a distorted 2 x 2. 
      Ends in a 2 x 4.
Note:  The others ( dancers) in the above diagrams may be facing
  any direction.  If there are more than two Leaders in Lines, the caller must
  specify who will Trade by saying 'Prefer  the anyone to Trade,
  all Checker Board | Box anything'.
dancers) in the above diagrams may be facing
  any direction.  If there are more than two Leaders in Lines, the caller must
  specify who will Trade by saying 'Prefer  the anyone to Trade,
  all Checker Board | Box anything'.
Hint: dancers who do the Trade can help the other dancers by precisely
  doing their Trade and then identifying the adjacent vacated positions by
  pointing to them.
Note: Checker Board | Box is often taught as: Leaders Trade as
  the Others move into the Center and make the given formation 
  (a 1 x 4 if Checker Board, or a 2 x 2 if Checker Box), 
  do the anything call and then get back to the vacated
  spots.  As dancers, we prefer to do the anything call working in a
  Distorted Column | Line | Wave | Box.  That is, try to stay on the original
  spots and only move off them if necessary.  For example, from Parallel L-H
  Waves, if the call is Checker Box Cross & Turn, the Trailing End (Belle) would
  simply U-Turn Back instead of move into the Center, make a Box, U-Turn Back,
  and Veer out to become an End.
| Checker Board Dixie Style To A Wave 
 |   |  |   |  | before Checker Board
 Dixie Style To A Wave
 |  | after Leaders in Lines Trade
 as Others Distorted Column
 Dixie Style To A Wave
  (done)  | 
 | 
Checker formation anything [C4] (Vic Ceder):
 Leaders (who must be in Lines) Trade with each other as the others do
  the anything call working in a distorted formation.  The
  designated formation is a 4-dancer formation such as a Diamond,
  Single 1/4 Tag, or "Z".  Hence, Checker Board could alternatively be
  called as Checker Column, Checker Line, or Checker Wave.
| Checker Diamond Cut The Diamond 
 |   |  |   |  | before Checker Diamond
 Cut The Diamond
 |  | after Leaders in Lines Trade
 as Others Distorted Diamond
 Cut The Diamond
  (done)  | 
 |