Original Trailers can not Roll. Single Checkmate is the Single version of
Checkmate The Column [A2].
Note that on Checkmate The Column, the Trailing two cannot Roll since their last
part is to Step Ahead. EN: 40
Cheat: Box Counter Rotate 1/4; Box Circulate. This cheat
emphasizes that only the original Leaders can Roll. Some other
glossaries list a similar cheat (Box Circulate; Box Counter
Rotate 1/4) which makes it seem as if everyone can Roll. EN: 60