From a 2 x 4 (or other applicable formations) with precisely two Leaders in each Line. EN: 10

In the following diagrams, EN: 20

designates the Leaders in each Line as EN: 22

designates the other dancers. The dancers designated by EN: 24

can be facing in any direction other than the same direction as the EN: 26

dancers in their 1 x 4. EN: 28

Note: The others ( EN: 90

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'. EN: 95

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. EN: 100

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. EN: 160

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. EN: 291